Detroit Lions cornerback Chris Houston had perhaps his worst season as a pro last year, due in part to an assortment of injuries.

He missed four of the final five games with a toe injury.

Now as he tries to turn the page in 2014 ... he's still dealing with the injury, which causes some concern about whether he can recapture the form that once made him Detroit's top cornerback.

How certain are the Lions he can do it?

"I'm not certain," coach Jim Caldwell said candidly. "You're never 100-percent certain about anything, you know? I can't be certain if I'm going to wake up tomorrow morning. Tomorrow's not promised to me, so I'm not certain. We'll see.

"He's a young man and typically they heal pretty quickly, unlike old guys like me. But we anticipate that he'll come along. We'll have to wait and see."

Houston was expected to be the Lions' No. 1 corner last year, after signing a five-year, $25 million in the offseason. But he allowed the 10th-worst QB rating among qualifying corners, according to ProFootballFocus, and was so bad that he briefly was benched in the second half of the season.

He told MLive those struggles were the result of his injuries -- which included a balky hamstring -- and off-field distractions that he has declined to disclose.