Tony Scheffler can't hang on to this pass on Sunday against the Packers. (Daniel Mears / Detroit News)
Allen Park Ė Lions tight end Tony Scheffler still hasn't been cleared to practice after he suffered a brain injury in Green Bay. It was his third concussion in four years.
"The concern with Scheffler is he didn't manifest symptoms until two days after," coach Jim Schwartz said Thursday. "Even on Monday he didn't have headaches or any of the other symptoms. When he came to work Tuesday we saw it.
"That's why it's so hard to diagnose these things. Ö Anytime you get a concussion, whether itís your first, third, you bounce back quickly or you donít, itís always a concern."
If Scheffler isn't cleared before Sunday, it would leave the team with two available tight ends, Brandon Pettigrew and rookie Joseph Fauria. Offensive coordinator Scott Linehan had said Fauria's role would expand and if they needed a third tight end for the six-man offensive line formation, he could use guard Dylan Gandy or tackle LaAdrian Waddle.
Cornerback Chris Houston, who missed Wednesday with hamstring soreness, returned to practice Thursday. He was limited. Safety Louis Delmas (knee) and safety Glover Quin (ankle) were also limited.
Right tackle Jason Fox (knee), running back Theo Riddick (concussion) and linebacker Ashlee Palmer (ankle) were unable to practice.