Conor McGregor hints at retirement on Twitter

Could Conor McGregor be retiring from the UFC?

McGregor sent out a cryptic tweet Tuesday that appeared to indicate he's walking away from the Octagon:

Initially, it seemed McGregor was having fun at the expense of the media and UFC fans, but Ariel Helwani of MMAFighting.com reports the tweet isn't a joke at all.

Helwani says the reasons behind the retirement announcement are unclear but many are speculating it's a play for more money, as McGregor is reportedly dissatisfied with his UFC 200 contract.

He recently tweeted about training for his upcoming rematch with Nate Diaz at UFC 200 on July 9 and has made it clear in the past that he's set on becoming the greatest fighter in UFC history before he decides to walk away.

However, McGregor is one of the sporting world's most unpredictable personalities, so it's not out of the realm of possibility that he's decided to end his career early.