If Matt Brown wants to fight a Diaz brother, it will have to be Nate. At least that is what Nate Diaz is saying.

Diaz, who has not fought since a 2013 victory over Gray Maynard, told MMAFighting.com that he would move up from lightweight to welterweight and face Brown, who has won seven straight and positioned himself as a title contender.

“I want the Matt Brown fight,” Diaz said. “That’s what I’m looking for. My brother is retired. So if this guy wants to fight a Diaz, he’s got to fight me.”

Nate Diaz (17-9) competed at 170 pounds until a 2011 move to 155 where he defeated Takanori Gomi via submission. He followed that up with wins over Donald Cerrone and Jim Miller before dropping two straight to Benson Henderson and Josh Thomson.

The loss to Henderson in 2012 was for the UFC lightweight title.

Diaz was the Season 5 lightweight winner on The Ultimate Fighter and competed for the WEC title in the division.

Nick Diaz (26-9), the older brother by a year, retired from MMA after a 2013 decision loss to Georges St-Pierre for the UFC welterweight title. He is a former Strikeforce champion, but has reportedly turned down several offers made to bring him out of retirement.

As for Brown, Nate Diaz added that “I’m trying to fight the baddest (expletive) out there. I’m not trying to fight some lame (expletive) fighter that they’re trying to build off of me.”

Even though he signed a new contract prior to the Henderson title fight, Diaz has remained on the sidelines, asking the UFC to renegotiate his contract.