Conor McGregor has returned the gym ... seemingly preparing to return to the Octagon in January to take on Dustin Poirier.
The 32-year-old UFC superstar was doing some boxing drills (he appears to be at Straight Blast Gym in Ireland) ... trying to get himself ready to fight for the first time since January, when he destroyed Donald "Cowboy" Cerrone.
As we previously reported, both Conor and Dustin have publicly agreed to fight on January 23rd -- but Dana White recently told us the contracts have not been officially signed.