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. https://twitter.com/TheNotoriousMMA/status/731758671558905856 Why? Because 'The Notorious' had seemingly rented out Ferguson's California gym, Box 'N Burn, for some personal training this weekend. https://www.instagram.com/p/BDKuzTqx5V4/ 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. https://twitter.com/TonyFergusonXT/status/731768988196179968 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. https://twitter.com/TheHeat001/status/731575261347516417 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.