The Call-Up Process: How Players Reach the Majors
How a minor leaguer gets to the majors: the 26-man and 40-man rosters, options, recalls, designations for assignment, the Rule 5 draft and service time, explained step by step as of the 2025 season.
Players do not simply get promoted to the major leagues in the way an employee moves up a ladder. Reaching the majors involves two rosters, a set of contract rules that decide who can be moved and when, and a clock that measures major-league service time. A prospect who is hitting .350 in Triple-A can stay in the minors for weeks because of roster arithmetic, and a mediocre veteran can be added overnight because a spot has opened.
The details look like bureaucracy, but they explain most of the news a fan sees on a transaction wire: why a team called up a player on Tuesday and sent him down on Friday, why a prospect was held in the minors until June, why a good reliever was suddenly designated for assignment. This article walks through the process in the order a player would meet it, with the rules as of the 2025 season. The collective bargaining agreement can change the details, so for a specific ruling check the official source at mlb.com.
None of this is advice for a player or an agent. It is an explanation of how the roster moves you see in the news and on club pages are put together.
Two rosters, not one
Every major-league club has two rosters that matter. The active roster is the group that can play in a given game. In recent seasons it has been 26 players, expanded to 28 in September, with limits on the number of pitchers a club may carry. The 40-man roster is a larger list of players under contract to the major-league club, including the active players, players on the injured list, and players who have been assigned to the minors but remain the club's property for major-league purposes.
| Roster | Size | Who is on it |
|---|---|---|
| Active roster | 26 (28 in September) | Players available for the next game |
| 40-man roster | 40 | Active players, injured-list players and optioned prospects |
| Everyone else | Not capped | Minor leaguers on minor-league contracts |
The 40-man roster is the one that determines whether a player can be called up easily. A player on the 40-man who is in the minors can be brought up as soon as there is a spot on the active roster. A player who is not on the 40-man must first be added to it, which costs the club a 40-man spot and often means removing another player. Most of the interesting decisions in roster management come from this gap.
Players on the 60-day injured list do not count against the 40-man limit, which is why a club may move a seriously injured player there to open a spot.
The minor-league ladder
Each major-league club has affiliates at four full-season levels: Triple-A, Double-A, High-A and Single-A. Below those are the complex leagues in Arizona and Florida and the Dominican Summer League, where younger players and many international signees begin. Triple-A is the highest level and the one closest to the majors, and its two leagues are the International League and the Pacific Coast League, which are covered in our article on those leagues.
The affiliation system rests on player development contracts between the major-league club and the minor-league team. Under the current arrangement, covered in our explainer on minor league affiliation, each major-league club controls the players on its affiliates, while the minor-league clubs are independent businesses. Players come from several sources: the amateur draft, which has been 20 rounds in recent years; international amateur signings, described in our article on the bonus pool system; and signings from other leagues, including independent leagues.
A typical high-school draftee starts in a complex league or Single-A. A college draftee may start higher. Players do skip levels, particularly when performance or need demands it, and some prospects go from Double-A to the majors without a stop in Triple-A. There is no fixed schedule, and many talented players spend years at one level.
Route one: selecting the contract
The first route to the majors is for a player who is not on the 40-man roster. The club must add him, which the transaction wire describes as selecting his contract. This needs two open spots: a place on the 40-man, and a place on the active roster.
Making room on the 40-man can be done in several ways. The club can trade a player, release a player, designate him for assignment, or move an injured player to the 60-day list. Each has costs. A club that is short of 40-man spots may delay a prospect's promotion even when the prospect is ready, because the player who would have to go off the list is someone the club is not willing to lose.
Once a player has been added, he is on the 40-man for as long as the club keeps him there, and this changes what the club can do with him. Players on the 40-man can be moved between the majors and minors without waivers, as long as they have options.
Route two: the recall
The second route is for a player who is already on the 40-man roster and has been sent to the minors. He is recalled, and the only requirement is a spot on the active roster. This is the easiest call-up, and it explains why teams often shuttle the same few players, usually relievers and bench players, between Triple-A and the majors. Fresh arms are needed after a long game, and a recalled pitcher replaces a tired one.
The process of sending a player from the majors to the minors is the option. A club options a player, and he plays for an affiliate while remaining on the 40-man roster.
Options, explained with an example
An option is the right to send a player to the minors without exposing him to waivers. A player on the 40-man roster generally has three option years. A year is used when the player spends 20 or more days in the minors in a season. Once a player has used up his options, he is out of options, and the club cannot send him down without first passing him through waivers, where another club can claim him.
Here is how it works with a hypothetical player. A pitcher is added to the 40-man roster in his second professional season and has all three option years. He spends the full year in Triple-A, which uses year one. The next season he makes the major-league team in April, is sent to the minors for two weeks in June, and is recalled; that is under 20 days, so he keeps his option. The third year he is sent down for 45 days, which uses year two. In his fourth season, he has one option left. If he is optioned again, he is out of options, and from then on the club must keep him on the active roster or risk losing him.
That is why a club often keeps a mediocre but out-of-options player on the active roster long after a prospect with options might have been called up. The out-of-options player cannot be sent down without being exposed, so the club decides based on that. It is the reverse of how fans expect it to work, and it explains many roster moves that seem to ignore performance.
Recent agreements added limits on how often a club can option the same player in a season, and set a minimum time a player must stay in the minors after being optioned, generally about 15 days for a pitcher and 10 for a position player, unless he replaces an injured player. Check the current agreement for the exact figures.
Designated for assignment
Designating a player for assignment, usually shortened to DFA, takes him off the 40-man roster immediately. The club then has a limited time, a week as of recent seasons, to trade him, release him or place him on waivers. During that period he is in limbo. If he goes on waivers, other clubs can claim him, and the claiming club takes over his contract and his place on its 40-man roster. If nobody claims him, he can be sent outright to the minors, in some cases with the right to refuse the assignment and become a free agent, depending on his service time and previous outright assignments.
A DFA is not a punishment. Clubs use it as a fast way to open a spot, often for a player the club still likes but not enough to protect.
Protecting prospects from the Rule 5 draft
Clubs also face a deadline that pushes them to add prospects to the 40-man roster. The Rule 5 draft, held at the winter meetings, allows clubs to select players from other clubs' systems who are not on the 40-man roster and who have been in pro baseball for long enough, usually four or five years depending on when they signed. A club that selects a player in the major-league phase must keep him on the active roster all season or offer him back to his old club.
To protect good prospects, clubs add them to the 40-man roster before the draft. This is one of the most important reasons players are added in November, and why a roster spot gets cleared right before the deadline.
A related rule applies to older minor leaguers. A player who has spent a long time in the minors without being added to the 40-man roster, about six years, can elect minor-league free agency and sign with any club. That deadline also forces decisions: promote, protect or lose.
Service time and why the date matters
Major-league service time is counted in days on the active roster or the injured list, and 172 days make a year. The regular season is a few days longer than that, so a player called up a few weeks late finishes his first season short of a full year. A player needs six years of service to become a free agent, and three years, plus a group that qualifies sooner as so-called Super Two players, to qualify for salary arbitration.
For that reason the date of a call-up can matter to a club's finances and to a player's future. A club that holds a top prospect in the minors for the first few weeks of a season may gain a full extra year of control before free agency. This has been a source of conflict between players and clubs, and the 2022 agreement introduced an incentive meant to encourage clubs to promote top prospects early, in the form of draft-pick rewards tied to how highly those players finish in the annual award voting. The details change with each agreement.
A call-up in five steps
A hypothetical shows how the pieces fit. A club's regular center fielder is injured and goes on the injured list. The club needs an outfielder by tomorrow.
- The club lists its choices. One is an outfielder who is already on the 40-man roster and is playing in Triple-A. Another is a better prospect at Double-A who is not on the 40-man.
- If it picks the first, the move is a recall. Placing the injured player on the injured list frees an active-roster spot, the recalled player fills it, and the 40-man roster does not change.
- If it picks the prospect, the club must first make a 40-man spot. It might move a long-term injured pitcher to the 60-day list, or designate a marginal reliever for assignment. Only then can it select the prospect's contract.
- The club checks the clocks. Does the move start the prospect's service time in a way that matters, and will it use up an option year if he is sent down again in a few weeks?
- The transaction is announced, the player joins the club, and the minor-league affiliate fills his old spot from the level below.
Each step is routine, and the process is why a call-up that looks like a performance reward may in fact be a response to an injury and a roster count.
Other routes to the majors
Not every player comes up through the draft. Some are signed out of independent leagues, as described in our article on independent baseball leagues, after a team buys his contract. Some come from leagues abroad. Others are noticed in development settings such as the Arizona Fall League and the Futures Game. International tournaments also matter, as the World Baseball Classic shows, though players on those rosters are playing for their countries, not auditioning for a club.
September, doubleheaders and injuries
Call-ups cluster at certain times. In September the active roster expands from 26 to 28, so clubs can add two players, usually a pitcher and a bench player. Doubleheaders allow an extra player for a day in some cases. Injuries create the most call-ups, because every placement on the injured list opens an active-roster spot that has to be filled, often by the recall of a pitcher from Triple-A or a bench player from the minors.
Common questions
What does it mean to be called up? The player is added to the active roster, either by recall from the minors or by having his contract selected.
What is a cup of coffee? A very short stay in the majors, often a few games in September.
Why would a team keep a prospect in the minors? Reasons include roster spots, service-time timing, a need for more development at the level, and the fact that a player on the 40-man may have options while an older player does not.
Can a player refuse a demotion? Generally no for a player with options, since the club has the right to option him, but players with enough service time have rights regarding outright assignments.
Where to go next
To follow current prospects, use the minors section and the scores page, and the minor league baseball topic page collects more reading. For how to read the games that follow a call-up, see our guide to the box score.