WSOF will close its 2015 event schedule with an event on Dec. 18 in “Sin City” with the featherweight title on the line.

WSOF 26 will take place in Las Vegas, promotion Vice President Ali Abdelaziz told MMAjunkie, but a venue for the card has not yet been finalized.

Although details regarding WSOF 26 are still in the planning stages, Abdelaziz said the organization’s featherweight champion, Lance Palmer, is tentatively set to headline the card.

Palmer’s (10-1) opponent has not been determined, but it likely will be in the near future. WSOF 24 takes place Saturday, and the winner of a preliminary-card matchup between Alexandre Almeida (16-5) and Saul Almeida (18-5) will earn No. 1 contender status at 145 pounds.

“Lance Palmer is a guy that went though everybody and these guys, one of them was a Jungle Fights champion, one of them already won in World Series of Fighting, and they both are Almeidas,” Abdelaziz said. “An Almeida is going to be part of this title fight. It’s going to be a very tough test for Palmer.”

Also penciled in for WSOF 26 is a light heavyweight matchup featuring famed striking specialist Tyrone Spong (2-0). The “King of the Ring” has not competed in an MMA match since WSOF 4 in August 2013. He’s spent much of the past year on the sidelines after he suffered a broken leg throwing a kick in a GLORY kickboxing match in August 2014.

“We have a big card,” Abdelaziz said. “Spong is coming back, Lance Palmer’s coming back, and we’re working on some matchups. It’s going to be great. We are looking forward to it and it’s going to be awesome.”

For more on WSOF 26, check out the MMA Rumors section of the site.