MLS roster compliance encompasses a complex set of rules that govern how teams build and maintain their squads. Key rules include: the salary cap (approximately $5.47 million), a maximum roster size of 30 players, up to 8 international player slots, a maximum of 3 Designated Player slots, and minimum roster requirements including a specific number of domestic players.
Teams must also comply with rules around Homegrown Players (who do not count against international slots), Supplemental Roster spots for lower-cost players, and the Generation adidas program for young players entering the league through the draft. Violations of roster compliance rules can result in fines, loss of allocation money, or other penalties. Front offices employ dedicated compliance staff to navigate these intricate regulations throughout the season.