Doc Rivers Uncertain On NBA Coaching Future, 'I'm Just Gonna Enjoy Life'

Doc Rivers says he has no idea if he'll ever return to an NBA sideline ... the coaching great tells TMZ Sports his future in the sport is completely up in the air.

We spoke with Rivers -- who was recently let go from his gig with the Philadelphia 76ers -- outside Jon & Vinny's in LA this week ... and he made it clear his main focus is enjoying his recently-cleared schedule.

"I don't know what I'm gonna do," Rivers told us. "I'm just gonna enjoy life."

The championship-winning coach was fired back in May after going 154-82 through three seasons in the City of Brotherly Love ... and if a coaching job isn't in the cards, there are rumblings he could put on the headset for a broadcasting role with ESPN.

Rivers didn't tip his hand on what's next for him ... but certainly seemed to be in great spirits as he deflected questions about whether teams were calling his line.

"I just enjoy life," he told us ... adding he was having a "phenomenal" summer.

The 61-year-old former NBA star is one of the most successful coaches in league history ... leading the sideline for the Magic, Celtics, Clippers and Sixers through the years.