But inspired by football’s coach’s challenge rule, the NBA has instituted a similar process for the 2019-20 season. During all 48 minutes, a coach can challenge a called foul on the court. Except for in the last two minutes of a game (when those plays are reviewed anyway), a coach can also challenge an out of bounds call or a goaltending. As in the NFL, the visual evidence has to be clear and conclusive for a call to be overturned.
To signal for a challenge, the coach has to call a timeout, then tell the referees he’d like a challenge by swirling his finger in the air.