Each team roster contains a minimum of 16 players and a maximum of 18 players. Players must turn 18 and may not turn 24 before December 31. Each team may have 2 veterans who may not turn 26 and 2 rookies who must turn 17 before December 31.
Since Europe doesn’t have collegiate baseball leagues, European players are allowed to play club baseball during the regular season. Host cities have the opportunity to add 2 regional or national prospects and 1 assistant coach to each team roster.