Postseason Roster
This roster is in effect only if the team clinches for and plays in the postseason. The postseason roster is integrated and has no limit to a number of players on the roster. Any player regardless of spending time in the minor leagues of any class such as being optioned to, outrighted to, being called up or recalled to the majors will be eligible to participate in the postseason. The only restriction is that the player must have been in the organization by August 31, and played or appeared in at least one game with the major league team in the regular season.
Read more about this topic: Major League Baseball Rosters