Each team can have 25 players on its active roster in the postseason. They can change the roster between rounds, for example replacing an injured player with another player on the 40 man roster.
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There is a 40 man roster during the playoffs. Each game the team can still only use a 25 man roster, however, the 40 man roster is a roster of all eligible players for the playoffs as you can not assign or call up players to/from your farm system once playoffs start