Conor McGregor -- Already Written Out of 'xXx' Movie ... Says Michael Bisping (VIDEO)

Conor McGregor's not just out of UFC 200 -- he's also out of Vin Diesel's new 'xXx' movie ... and according to UFC star Michael Bisping, his part's already been written out.

McGregor pulled out of the flick last month to focus on his rematch with Nate Diaz in July -- but now that Dana White yanked him from UFC 200 for refusing to participate in the promotional campaign, we were wondering if Conor would shift his focus back to Hollywood.

But according to Bisping -- who has a role in the movie -- it's too little, too late.

"His part got written out," Bisping said as he was leaving the set in Toronto.

It's too bad for Conor ... Bisping says he's having a blast shooting the film -- and if it's any good, it could be a huge career booster for him.