Ryan Garcia has challenged Conor McGregor to a bare-knuckle fight after the MMA star told the boxer to ‘get your head together or kill yourself’.

In a now-deleted post on social media, McGregor sent a chilling threat to Garcia after he tested positive for a banned substance.

Garcia failed anti-doping tests the day before and the day of his upset win over Devin Haney last month. The 25-year-old – who also came in 3lbs overweight – tested positive for the performance enhancing ostarine but the results did not emerge until after the fight.

Garcia has denied cheating but McGregor sent an X-rated message on social media, warning that if he was Haney’s dad ‘you’re dead no matter what.’

The troubled boxer responded on Friday afternoon, writing on social media: ‘If I see Conor McGregor I’m going to break your weak a** ankle.’ He then challenged the Irishman to a bare knuckle fight, adding: ‘Winner gets your trash a** whiskey brand (Proper No. Twelve)’

Ryan Garcia failed anti-doping tests the day before and the day of his win over Devin Haney

‘Cheated the weight and was juiced, lifetime ban. Sad to see, sad to say,’ Conor McGregor said

Garcia also accused McGregor of avoiding anti-doping tests because he was taking steroids. The UFC star has never tested positive for a banned substance.

‘You ran from being tested (because) you were on Roids,’ Garcia said.

McGregor, who is slated to return to the UFC next month after three years out, started the spat with a lengthy message to Garcia.

‘GET YOUR HEAD TOGETHER OR KILL YOURSELF,’ McGregor wrote before the post was deleted.

‘Cheated the weight and was juiced, lifetime ban. Sad to see, sad to say. Sad and a bit sick. Don’t come near me if I ever see you again Ryan Garcia.

‘I am actually disgusted… If I was Haney’s dad you’re dead no matter what for doing that. Crazy. What the f*** happened to you, you little fool.

McGregor sent Garcia the message on social media but the post has since been deleted

After the doping test results emerged, Garcia insisted: ‘Everybody knows that I don’t cheat’

‘Get your head together (because) I’m gonna smash it in with elbows if you don’t. Fair play Devin well done. Your performance has just become even more heroic.’

McGregor also took aim at fellow UFC fighter Sean O’Malley, who tested positive for ostarine in 2019. The Irishman offered to fly both him and Garcia to Dublin for a scrap in the parking lot.

‘I’ll bust yous both up, do yous want a spar I will set flights right now for you both for a full on spar each. Hotel, black forge inn the lot,’ he wrote.

‘I’ll ride you both like yous are ostriches. WTF is up. What do you think are at?’

After the results emerged, Garcia insisted: ‘Everybody knows that I don’t cheat… I’ve never taken a steroid.’