Source: NFL eyes Lions' report on Stafford injury

(0:48)CHICAGO -- The NFL is looking into how the Detroit Lions handled the reporting of quarterback Matthew Stafford's back injury in the week leading up to Sunday's loss to Chicago, including the designation of Stafford as questionable before he was ruled out, a source said."We'll look into it and gather all the facts," a league source told ESPN, "as is standard in situations like this."This isn't the first time the league has looked into potential injury report violations. For him to not be out there, we know it's a really serious situation."Offensive guard Joe Dahl told ESPN on Sunday that the Lions found out "last night, maybe." Tight end Logan Thomas said the team found out Saturday as well.Stafford's replacement at quarterback Sunday, Jeff Driskel, said he went through a typical week of practice, with a "sprinkling" of first-team reps, and he was told Sunday he would be the starter.However, Lions coach Matt Patricia, in his postgame news conference, said the decision was made Sunday that "it was unsafe" for Stafford to play.