# MLB Playoff Roster Injury Replacement? **URL:** \ **Category:** The Game Room\ **Created:** [August 14, 2009, 12:58am UTC](https://boards.straightdope.com/t/mlb-playoff-roster-injury-replacement/506361 "2009-08-14T00:58:47Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Jonathan\_Chance](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/jonathan_chance/32/701_2.png) [@Jonathan\_Chance](https://boards.straightdope.com/u/Jonathan_Chance)\ **Post date:** [August 14, 2009, 12:58am UTC](https://boards.straightdope.com/t/mlb-playoff-roster-injury-replacement/506361/1 "2009-08-14T00:58:47Z")
What exactly, are the rules for replacing a player on a playoff roster during a season. Example: 1 Game one occurs. 2. Player A is injured. 3. When does team get to activate another player to take that roster spot? During that series. Before a following series? What? I haven’t been able to find it in the rulebook. ---
**Author:** ![MOIDALIZE](https://avatars.discourse-cdn.com/v4/letter/m/e274bd/32.png) [@MOIDALIZE](https://boards.straightdope.com/u/MOIDALIZE)\ **Post date:** [August 14, 2009, 1:17am UTC](https://boards.straightdope.com/t/mlb-playoff-roster-injury-replacement/506361/2 "2009-08-14T01:17:38Z")
Teams have to set a 40 man roster by August 31st. The “September callups” can be used in games during this month to give teams a chance to take a look at them before the playoffs (usually they’re limited to the 25 man active roster). If they make the playoffs, they must set a 25 man active playoff roster. Between each round of the playoffs (after the division series and again after the LCS) a team can replace someone from the 25 man active roster with somebody from the pool of 40. [This article](http://www.usatoday.com/sports/bbw/2006-10-04-cover-playoff-rosters_x.htm) explains some of the roster strategy. ---
**Author:** ![Jonathan\_Chance](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/jonathan_chance/32/701_2.png) [@Jonathan\_Chance](https://boards.straightdope.com/u/Jonathan_Chance)\ **Post date:** [August 14, 2009, 1:22am UTC](https://boards.straightdope.com/t/mlb-playoff-roster-injury-replacement/506361/3 "2009-08-14T01:22:54Z")
Well, that part I understand. I’m speaking abotu whether a player, already on the playoff roster, gets injured during a playoff series. Can that player be replaced on the roster immediately or is the team involved required to go forward with 24 active players until that playoff series is concluded. ---
**Author:** ![MOIDALIZE](https://avatars.discourse-cdn.com/v4/letter/m/e274bd/32.png) [@MOIDALIZE](https://boards.straightdope.com/u/MOIDALIZE)\ **Post date:** [August 14, 2009, 2:16am UTC](https://boards.straightdope.com/t/mlb-playoff-roster-injury-replacement/506361/4 "2009-08-14T02:16:51Z")
They’re stuck with their 25 man roster until the series is ended. ---
**Author:** ![Jonathan\_Chance](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/jonathan_chance/32/701_2.png) [@Jonathan\_Chance](https://boards.straightdope.com/u/Jonathan_Chance)\ **Post date:** [August 14, 2009, 2:19am UTC](https://boards.straightdope.com/t/mlb-playoff-roster-injury-replacement/506361/5 "2009-08-14T02:19:52Z")
That’s my instinct. Do you have a place in the rulebook for it? ---
**Author:** ![Freddy\_the\_Pig](https://avatars.discourse-cdn.com/v4/letter/f/a587f6/32.png) [@Freddy\_the\_Pig](https://boards.straightdope.com/u/Freddy_the_Pig)\ **Post date:** [August 14, 2009, 3:01am UTC](https://boards.straightdope.com/t/mlb-playoff-roster-injury-replacement/506361/6 "2009-08-14T03:01:04Z")
> [@Jonathan\_Chance](#): > > That’s my instinct. Do you have a place in the rulebook for it? No, none of us do, because the rules governing rosters aren’t available to the public. See [here](http://assets.espn.go.com/mlb/s/transanctionsprimer.html) and [here](http://en.wikipedia.org/wiki/Baseball_business_rules) for some discussion (of the unpublished rules, not of the playoff roster issue). I know for a fact, however (from media discussion of postseason roster decisions) that you can change your roster between rounds, but never during a round.