Matthew Stafford suffered an injured hamstring and a sprained ankle in the Detroit Lions' 27-24 loss to the Carolina Panthers in Week 5.

Stafford is not sure if he'll be healthy enough to play in Week 6.

Jim Caldwell told reporters to "check the report" when asked about Stafford's injuries. 

Stafford said he and the Lions are protecting the information because they believe it offers a "competitive advantage or disadvantage," as well as being for the safety of players.

"Why would you want another team to know exactly what's going on with you if you don't have to mention it?" Stafford said. "Obviously the reports come out and all that kind of stuff, and that's about as much information as we're as a team going to get out.

"There's no real win in telling everybody in America what's going on with ya, right? 'What's the positive' is how I look at it."