The NBA will implement a coach’s challenge during the upcoming Summer League games and now anticipates using the rule during the 2019-20 regular season as part of a one-year pilot program, according to a memo sent to all teams, per ESPN’s Zach Lowe.

Coaches of each team will get one challenge per game, and they will lose it even if the challenge is successful, according to the aforementioned memo. Coaches can only use it to challenge fouls called, goaltending, basket interference and plays in which the ball has been knocked out of bounds.

The league has been testing this version of the challenge system in the G League over the last two seasons.

According to the memo, coaches must have at least one timeout remaining to use a challenge. The team must first call a timeout immediately after the event they would like to challenge, and the coach must “twirl his/her index finger toward the referees” to signal for the challenge, much like current coaches and players do now to plead for a play to be reviewed.

If the challenge proves successful, the team retains the timeout it used to stop play. If the challenge is unsuccessful, they lose that timeout.

The crew chief among the referees will determine the outcome of the challenges that involve fouls, while the NBA’s Replay Center (located remotely in Secaucus, New Jersey) will decide all non-foul challenges.

Technical fouls due to flagrant nature that occurred during or “immediately after” the challenged call will stand regardless of the outcome of the challenge, according to the memo.

With this change, coaches will now be able to have a say if they feel they’ve been unjustly officiated, which the NBA hopes will ameliorate the rift between players and officials in some way, while also limiting technical fouls and ejections given to head coaches due to stern disagreements with the referees.