Tony Ferguson is furious as slimmed-down Conor McGregor rents out his California gym

It took us a second or two to decipher Tony Ferguson's angry tweet on Sunday morning.

The top lightweight contender was apparently irritated when a picture of Conor McGregor showed up on his Twitter feed.

Why?

Because 'The Notorious' had seemingly rented out Ferguson's California gym, Box 'N Burn, for some personal training this weekend.

Ferguson, who takes on Michael Chiesa next, replied to McGregor by ordering him back to Ireland, calling the Dubliner a 'traitor' for exploring training options in the United States.

Settin Standards & locations for others 2 follow. i.e @TheNotoriousMMA You rented the Gym I train at w/ my Trainer... #BacktoIreland Traitor — Tony Ferguson (@TonyFergusonXT) May 15, 2016

It's not clear whether Ferguson was suggesting that he was unable to get into Box 'N Burn due to McGregor's presence but it's obvious that he was unhappy that the reigning UFC featherweight champion was getting work in with the likes of former IBO & IBF welterweight champion Chris van Heerden.

What a Humble life Experience having the pleasure going Toe 2 Toe with The Biggest name in UFC @thenotoriousmma pic.twitter.com/d1FjNMyEUZ — Chris van Heerden (@TheHeat001) May 14, 2016

McGregor is looking noticeably slimmed down from his welterweight debut which the Irishman lost when Nate Diaz submitted him in the second round of their UFC 196 meeting in March.

McGregor was scheduled to rematch Diaz at UFC 200 but was pulled from the card after refusing to fulfil certain media obligations.

And judging by his build, he's well on his way back to 145 lbs to defend his world title after the summer.