Conor McGregor might be retired, but he's not done calling for a rematch with Khabib Nurmagomedov.

Axar.az reports citing USA Today.

He's willing to go low to get it, too.

On Tuesday night, McGregor (21-4 MMA, 9-2 UFC) took aim once again at Nurmagomedov (27-0 MMA, 11-0 UFC), imploring the UFC lightweight champion not to be scared of running back their UFC 229 title fight won by Nurmagomedov via fourth-round submission.

" Don't be scared of the rematch you little scurrying rat," McGregor tweeted. " You will do what you are told like you always do."

Prior to that message, McGregor got personal, tweeting two photos from Nurmagomedov's wedding day, accompanied by a personal attack on his wife.

"Your wife is a towel mate," McGregor said.

The tweet was up for roughly 15 minutes before McGregor deleted it, though MMA Junkie captured a screen grab.

(via @TheNotoriousMMA on Twitter)

Nurmagomedov and his wife, whose name remains a mystery, have two children together - a son and a daughter. His wife rarely has been seen in public. McGregor has a son and daughter with his girlfriend, Dee Devlin.

It's not the first time McGregor has crossed into questionable territory with his trash talk. During the build-up to UFC 229, McGregor went after Nurmagomedov's religion (he's Muslim), father and country. Nurmagomedov said the barrage of personal attacks led to him jumping the octagon fence and going after McGregor's corner moments after his victory, inciting an all-out brawl.

McGregor's tweet likely was in response to comments made by Nurmagomedov earlier Tuesday. Speaking at a Moscow university, Nurmagomedov referred to McGregor as " a jealous wife" in expressing doubt about McGregor's retirement, which the former UFC two-division champion suddenly announced last week on Twitter.

"I don't think he's finished," Nurmagomedov said. He added, "Conor acts like a jealous wife who says 'I will leave' all the time but then comes back."