WATCH: When Conor McGregor fought ‘The Mountain’

It isn't often Conor McGregor is in a fight and viewers are fearful for his safety, but that was the case watching this clip released today.

McGregor tweeted to say: “Today I had a bare-knuckle fight off a 180kg monster called 'The Mountain'.

“I'd never fought a man that big before.”

Today I had a bare-knuckle fight off a 180kg monster called 'The Mountain'
I'd never fought a man that big before. pic.twitter.com/BM22JOeZK1

— Conor McGregor (@TheNotoriousMMA) October 31, 2015

His opponent in the ring?

Professional strongman Hafthór Júlíus Björnsson, best known for his role as The Mountain in Game of Thrones.

Check it out.