Anthony Pettis injured while training

Lightweight contender Anthony Pettis sprained his shoulder while training, but the injury will not prevent a potential showdown with Donald Cerrone, a source close to the fighter told ESPN.com on Tuesday.

Pettis revealed earlier Tuesday that he suffered an injury but did not offer specifics. According to the source, Pettis will miss a few training session but expects to return to action by January.

His last UFC appearance occurred on Feb. 25 when he knocked out Joe Lauzon in the first round at UFC 144.

"Can't catch a break, injuries [stink]," Pettis said on Twitter.

Pettis and Cerrone have been involved in a war of words for several months. In August, Cerrone accused Pettis of ducking him.

"I've been trying to fight Anthony for a while now, and every time I suggest it, his manager comes back and says, 'Well, we're not ready. Maybe we'll fight somebody else right now,'" Cerrone said. "There's always an excuse. He wants to just sit and hide behind his win over Ben Henderson and keep riding that gravy train. But there are fighters who want to fight him and prove that he's all talk.

"Pettis was saying 'My shoulder won't be ready until October.' I told him I'd sit and wait until December for him, but Melvin stepped up and took the fight."

Pettis' trainer Duke Roufus denied that his fighter was ducking anyone and would be willing to face Cerrone when he fully heals.

Roufus told ESPN.com in August that Pettis competed with a serious shoulder injury in each of his two most recent fights. Team Pettis has not yet revealed which shoulder the fighter injured.

"He did get the shoulder surgery and is hoping to get on the Nov. 17 card," Roufus said.

UFC 154 is scheduled for Nov. 17 in Montreal, and neither Pettis nor Cerrone is slated to compete on the card.

While it remains unknown when Pettis and Cerrone will get to settle their differences, UFC president Dana White stated after UFC 150 that he will offer the fighters an opportunity to meet in a title eliminator.

Pettis made a name for himself in December 2010 when he defeated Henderson to claim the WEC lightweight title. Henderson is currently the UFC 155-pound champion.