The Sex and the City star, 39, has been spending his spare time mastering the art of Brazilian jiu-jitsu, but he was left hobbling away from one practice session this week (begs20Jul15).

Taking to on Tuesday (21Jul15), he wrote, "Injuries are humbling. Puts everything in perceptive, I hope it will make me smarter. Time to learn a new grappling game."

On Wednesday (22Jul15), doctors diagnosed him with a tear in his medial collateral ligament (MCL) and after his medical check-up at Los Angeles' Cedars-Sinai Medical Center, he returned to, posting, "Coming out of @CedarsSinai with great results. Only 1 ligament MCL torn. Yes, that is great news."

However, Marini is refusing to let the injury disrupt his training, adding, "Back to the academy asap (as soon as possible)."