NBA to test out challenge flag for replays starting with 2018 summer league

Though the league will test out replay challenges, there won't be a flag, and it's highly unlikely to be used next season.

Kahron Spearman

The NBA will experiment with a coach's challenge system on referees' calls during Las Vegas Summer League, according to league sources.


The NBA is working on a mechanism coaches can use to trigger challenges and what the parameters with the current rule and regulations. However, they won't use a flag, sources said. 

We've wanted to do it for years. The competition committee has been trying to figure out how we actually do this, because there's some complications. It's not quite as simple as you might imagine. We've had it in the G League for a number of years now and it's been very effective. We're going to try it in a very limited form in Summer League and we're going to see how it goes. We're going to let everybody look at it.

Both the NFL and Major League Baseball have coach's challenge systems involving replay, and the league has been increasingly making use of technology to have better-officiated games. 


The NBA has used summer league and the G League to test out rule changes over the past few summers, including adjusting goaltending rules and expanding the number of officials.


Though the league will test out the replay, it's highly unlikely to be used next season.