Developmental roster
（重定向自Developmental contract）
In Major League Soccer, in addition to the senior roster, each team can carry a developmental roster of a certain number of young players whose contracts do not count against the salary cap. The allowable size of developmental rosters has varied throughout its existence: in the 2005 season, it grew to ten from a former limit of six, but for the 2009 season, it was reduced to a limit of four players.