Diaz's manager/trainer, Cesar Gracie, told MMAJunkie.com Wednesday that there will be no rematch with Condit. Gracie would not offer the website any more information about the matter.
But Gracie was a bit more definitive when contacted by ESPN.com.
"Yeah, I said that (there will be no rematch). But that's all I can say," Gracie said. "I can't say anything else. I can't do anything.
"Quote that if you want to. There is not going to be a rematch. Other than that, that's all I can say."
Gracie's statement to ESPN.com about a Condit-Diaz rematch contradicts White, who Tuesday night said: "The rumor is true. Carlos did accept the fight today. Nick wanted the rematch the same night."
White added that he was expecting to meet with Condit Friday to work out a deal for the rematch.
Condit defeated Diaz by unanimous decision Saturday night at UFC 143 in Las Vegas to capture the interim 170-pound title.
After the scores were read, Diaz expressed his disappointment with the judges' scorecards (48-47, 49-46 and 49-46), vowing to retire from mixed martial arts competition.
"I'm not going to accept the fact that this was a loss," Diaz said. "I pushed him back the whole fight. I took him down. I think I'm done with this MMA. It's been a good time.
"I don't need this. I pushed this guy the whole fight. I landed the harder punches. He kicked me a few times."
Diaz needed a victory to land a fight with current UFC welterweight champion Georges St. Pierre later this year. The two were originally scheduled to meet in Saturday night's main event, but St. Pierre suffered a torn ACL in his right knee in December and pulled out of the bout.
Franklin McNeil covers mixed martial arts and boxing for ESPN.com. Follow him on Twitter at www.twitter.com/Franklin_McNeil.