DT Andre Fluellen has a concussion

ALLEN PARK, Mich. -- Detroit defensive tackle Andre Fluellen missed practice Wednesday with a concussion, the third one a Lions player has suffered in recent weeks.

Running back Theo Riddick and tight end Tony Scheffler, who has since been released, both had concussions against Green Bay on Oct. 6.

Fluellen was one of six Lions to miss practice Wednesday. The others were wide receiver Calvin Johnson (knee), left tackle Riley Reiff (hamstring), safety Louis Delmas (knee), right tackle Corey Hilliard (knee) and wide receiver Nate Burleson (forearm).

Tackle Jason Fox (knee) and cornerback Rashean Mathis (groin) were limited. Mathis said Wednesday he did not re-injure his groin against Cincinnati when he left the game in the fourth quarter.

Riddick practiced fully Wednesday for the first time since being concussed.