Nova Uniao fighter Hacran Dias (21-1-1 MMA, 1-0 UFC) has been forced out of next week’s UFC on FX 6 event.

MMAjunkie.com (www.mmajunkie.com) has learned from sources close to the fighter that Dias suffered an undisclosed injury in training and has been forced to withdraw from his planned appearance.

UFC officials have yet to announce the change, but sources close to the event indicated a search for a replacement opponent for Chad Mendes (12-1 MMA, 3-1 UFC) is currently underway.

Featuring a headliner of Ross Pearson vs. George Sotiropoulos and the final fights of “TUF: Smashes,” UFC on FX 6 takes place Dec. 15 at Gold Coast Convention and Exhibition Centre in Broadbeach, Gold Coast, Australia. The event’s main card airs live on FX (on Dec. 14 in the U.S. due to the time difference) following prelims on FUEL TV.

Mendes fought most recently at this past July’s UFC 148 event and delivered a vicious body shot to Cody McKenzie that brought him a 31-second TKO. It was the Team Alpha Male fighter’s first appearance since a KO loss to current featherweight champ Jose Aldo at UFC 142, which was the first setback of Mendes’ career. He went unbeaten in four fights for the now-defunct WEC and was 2-0 in the octagon before meeting Aldo.

Dias boasts an impressive ledger and has lost just once in his professional career. The Brazilian made his octagon debut at UFC 147 and outpointed Yuri Alcantara, extending his current win streak to nine fights. A timetable for his return was not immediately established.

For more on UFC on FX 6, stay tuned to the UFC Rumors section of the site.