UFC heavyweight champion Brock Lesnar will meet Shane Carwin in his second title defense at UFC 106 on Nov. 21 at the Mandalay Bay Events Center in Las Vegas.

Sherdog.com has confirmed the news through several sources with knowledge of the agreement. MMAMadness.com was the first to report on the card shift that will see Carwin move from a scheduled bout against Cain Velasquez at UFC 104.

Carwin has not answered calls for comment, but posted a message on his official Web Site Wednesday night.

“I can't confirm or deny anything. I can just tell you guys that I am training harder then ever and your support and loyalty will carry me through any fight they send my way,” he wrote.

Scheduling problems led to the dissolution of the previously agreed to Carwin-Velasquez matchup, according to a UFC source speaking anonymously because they were not authorized speak.

Lesnar, the company’s top pay-per-view draw, had minor surgery after defeating Frank Mir in July, creating uncertainty as to when he would be available to fight again.

His quick recovery allowed the promotion to bring him back in November, but with all of the top heavyweights already scheduled to fight, it was necessary to break up one of those bouts.

Carwin became a buzzworthy suitor for the champion following swift first-round technical knockouts over Neil Wain at UFC 89 and Gabriel Gonzaga at UFC 96. Carwin, a 1999 NCAA Div. II wrestling champion, battled back from an early knockdown from the Brazilian to finish Gonzaga with his heavy hands.

Lesnar, 32, unified the heavyweight title and avenged his only loss with a second-round drubbing of former interim champion Frank Mir at UFC 100 last July. Lesnar, a 2000 NCAA Div. I heavyweight champion, won the title against perennial competitor Randy Couture by second-round TKO at UFC 91 last November. It was the former World Wrestling Entertainment star’s fourth professional bout.

Loretta Hunt contributed to this report.