Cowboys Spencer undergoes knee surgery

Cowboys defensive end Anthony Spencer undergoes surgery on left knee on Thursday.

OXNARD, Calif. -- Dallas Cowboys defensive end Anthony Spencer underwent surgery on his left knee on Thursday in Dallas to "take out the trash," as he put it.

"The surgery was successful," Spencer's agent Jordan Woy tells FOX Sports Southwest. "Everything went well."

Though the announced recovery time is four weeks, Spencer has a bone bruise/fracture that a Cowboys source concedes could require as much as six weeks of rest. That source added they he is certain the injury is not serious.

"Anthony might feel fine in a few weeks and be ready to go," Woy said. "He wants to make sure he's healthy, but he's also excited to go help the Cowboys on the field."