ALLEN PARK —  Matthew Stafford practiced this morning for the first time this week, but he was limited. The rookie quarterback injured his knee in Sunday’s loss at Chicago.

Coach Jim Schwartz has not revealed the seriousness of the knee injury, although on Monday he said Stafford was day to day. Stafford does not appear to have a limp. When Stafford talked to reporters on Thursday he was not specific about the injury. The injury report which will list Stafford as doubtful, questionable or out will be released late this afternoon.

Quarterback Daunte Culpepper took the snaps with the starters on Wednesday and Thursday this week.

Safety Ko Simpson (hamstring) did not practice today. He started on Sunday in Chicago. 
— PAULA PASCHE