Allen Park — Lions linebacker DeAndre Levy still has not made his practice debut during the regular season, and coach Jim Caldwell continued his refusal to put a timetable on his potential return to the field on Thursday.

“It’s confidential in terms of what the doctors say to us,” he said of what information he could relay on Levy’s hip injury. “I don’t talk to you guys about injuries, let alone what doctors say. Now you’re really going to extremes.”

Extreme is how poorly the Lions defense has played in two games without the NFL’s second-leading tackler from 2014. The Lions currently rank 30th in total defense and 28th in points allowed and have been significantly more susceptible to the run and passes to tight ends without Levy.

Exactly when Levy will return, though, is a mystery.

“The injury report will tell everything that I’m going to say about a guy,” Caldwell said.

Tight end Brandon Pettigrew (hamstring) also sat on Thursday. He and Levy missed practice both days this week, and unless either can return Friday, they’ll both likely miss the Sunday night game against the Denver Broncos at Ford Field.

The good news for the Lions is that defensive end Ezekiel Ansah returned Thursday after missing practice with a back injury Wednesday, though he was limited. Safety Don Carey (foot) and offensive tackle Cornelius Lucas (ankle) were limited, too.

The Lions listed safeties James Ihedigbo (knee) and Glover Quin (lower leg) as full participants after being limited Wednesday. Quarterback Matthew Stafford (ribs) was a full participant as he’s been all season.

Although he was not listed on the injury report, right tackle LaAdrian Waddle participated in just the last few minutes of the portion of practice open to the media. He spent most of practice rubbing the lower area of his right leg with his shoe off then had a trainer re-tape his foot and ankle are before he returned.

One defensive lineman also had a countdown during practice, repeatedly yelling how much time remained in the portion open to the media.