When Nick Diaz announced at UFC 137 following a closely fought defeat to Carlos Condit that he would now be retiring from the sport many speculated that it was a heat of the moment decision and that he would reconsider in the cold light of day.

UFC president Dana White and Diaz own manager Cesar Gracie have both subscribed to that theory, believing that at 28 he’s still in the prime of his career and that he’s a natural born fighter.

However, Diaz own brother Nate who headlines May’s ‘UFC On FOX 3’ event is perhaps in a better position to know than anyone and he appears convinced that his sibling has hung up his gloves for good.

“I think he’s retired,” Diaz told MMAFighting’s Ariel Helwani. “He hasn’t been into this whole fighting thing for some time … since everything that goes on with the funny wins and losses. And not just for him, but for people on our team. So, I just think he’s relaxed right now, you know?”

He also reveals that he fully supports his brother’s decision, and in fact even goes as far as to say that he agrees with it.

“He’s my brother. I’m not going to tell him to go fight somebody. I think he’s doing the right thing. He made enough money to just chill back, sit back and relax.”

Personally, I still don’t believe we’ve seen the last of Nick Diaz in the UFC’s Octagon, but if there’s one thing we’ve come to expect from him it’s to expect the unexpected so it’s impossible to be 100% certain.

One thing we do know is that whether he wants to or not he’s not likely to be stepping into the Octagon for the remainder of the year as a post-fight drugs test following his bout with Condit came up positive for Marijuana meaning he now faces a suspension, the length of which has not yet been established.

Watch more of Diaz thoughts in the full interview below.