Jordan Woy, Spencer's agent, said Sunday his client is open to moving to defensive end.
"He can play either," Woy said. "They played a 4-3 for some of the snaps this past season."
Spencer was a defensive end at Purdue before he was selected by the Cowboys in the first round of the 2007 draft. Spencer's ability to play both positions makes him a marketable player because he'll become a free agent in March.
Spencer is coming off a season where he had a career-high 11 sacks. The Cowboys placed the franchise tag on Spencer, costing them $8.8 million in 2012.
Spencer could get franchised again, a move that would cost Dallas $10.6 million in 2013. But the Cowboys are currently over the salary cap by roughly $18 million, and several decisions would have to be made before either franchising Spencer again or working out a long-term deal.