PHILADELPHIA -- Philadelphia Eagles coach Doug Pederson said Friday, Dec. 14, that former North Dakota State quarterback Carson Wentz “has a stress injury” in his back that could take as long as three months to heal, but will not require surgery.

Pederson wouldn’t say when Wentz’s injury occurred. He called Wentz “questionable” for this Sunday’s game at Los Angeles against the Rams.

Pederson said Wentz’s injury “evolved,” but again he declined to be specific. Pederson said the diagnosis of a stress injury came after tests on Tuesday.

Pederson said the problem is not related to Wentz’s previous injury.

He said he could see how another significant injury so quickly could look like a “red flag” to observers, looking at the plans for Wentz’s career.

NFL sources said Thursday that Wentz has a fractured vertebra, revealed after the Eagles' quarterback underwent a series of tests this week.

The fracture will fully heal if given sufficient time, the source said. Wentz suffered a back problem in October, but it was unclear whether that injury was related to the latest diagnosis.

The Eagles have yet to rule Wentz out for Sunday night’s game against the Rams in Los Angeles, but he didn’t practice Wednesday and Thursday and is unlikely to play, based on the recent development. Backup Nick Foles has practiced with the first team and likely will start for the first time since Week 2.

The Eagles are still determining whether Wentz can play with the injury, the source said. The third-year quarterback from North Dakota State was at the start of Thursday’s workout and did some jogging. The 6-7 Eagles, who still have a shot at a playoff spot, have games against the Houston Texans and Washington Redskins after the Rams.