Conor McGregor Training In Ireland, 'Ready to Fight Now'

Conor McGregor spent his Monday training his ass off in his MMA gym in Ireland -- and sources connected to the UFC star tell us he's "ready to fight right now."

Conor had a sparring session with Hans Molenkamp -- who created the MMA equipment company, Triumph, and runs the Monster Energy combat program. He's also a black belt in Brazilian jiu-jitsu who trains with some of the best fighters in the world.

Hans and Conor have been tight for years -- so, when Hans touched down in Ireland, Conor invited him to Straight Blast Gym for a workout.

Our sources at the gym tell us ... Conor looked sharp in sparring sessions -- even cracking Hans in the face with that legendary left (you can see it in the video).

We're told Conor is training like he's getting ready for a fight -- and he's been talking about how badly he wants the rematch with Khabib.

One source extremely close to McGregor put it this way -- "He's ready to fight now. He's in training. Everything needs to line up correctly ... opponent, place and of course, money."

Conor was called out this weekend by UFC legend Donald "Cowboy" Cerrone -- McGregor has yet to respond.