By Ashley Dunkak

ALLEN PARK (CBS DETROIT) – The Detroit Lions secondary just got a little more shallow.

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Rookie cornerback Darius Slay, who had been playing more as veteran Chris Houston dealt with a knee injury, is listed as doubtful for Sunday’s road game against the Philadelphia Eagles.

Slay, who got hurt in Thursday’s non-contact practice, now also has a knee issue and was downgraded from limited practice to no practice.

“Still being evaluated,” head coach Jim Schwartz said. “We’ll just see where that takes us. It was sort of a freak thing.”

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Listed as questionable for Sunday’s game are Houston and running back Reggie Bush.

Bush, an integral part of the Lions offense for his ability to distract defenders from superstar wide receiver Calvin Johnson, is the NFL’s seventh-best rusher with 854 yards on the ground. He has also contributed 448 receiving yards.

According to the injury report, Bush is dealing with a calf injury, though he was upgraded Friday from no practice to limited practice.

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Playing at Philadelphia will likely already be a tough test for the Lions, but if several key members of the secondary plus one of the most important offensive players are all unavailable, it could be even more difficult than expected.