Rajon Rondo skipped his team’s trip to Sacramento late Friday night, preferring to stay in Los Angeles to celebrate his 28th birthday with friends and family instead.

Rondo hasn’t been playing on the second night of back-to-backs since returning from injury this season, and wasn’t scheduled to play Saturday night against the Kings. But he didn’t exactly clear his absence with the team, which created a bit of an internal firestorm.

A few days later, Celtics head coach Brad Stevens wouldn’t comment on whether or not Rondo would face discipline, leaving that to team president Danny Ainge to deal with. But he is treating it as though it’s nothing more than a minor infraction.