The Irish UFC star fights at 145 lbs. lbs Björnsson (the one off the telly's real name) is 6'9" and weighs 400 lbs.
Bit of a gap then, but McGregor probably edges it, just about. Check out the video!
Watch Conor McGregor take on 'The Mountain' from Game Of Thrones!
The fight they all wanted to see...
