Detroit Lions running back Reggie Bush said he's "optimistic" he won't miss any time with the left knee injury he suffered last week but he still hasn't been cleared by team doctors to play Sunday at Washington.

"I feel a lot better than I thought I was going to be feeling at this point in time" Bush said during his weekly interview on WXYT-FM (97.1) this morning. "My knee feels pretty good. It's a day-to-day thing right now. Thankfully I avoided anything serious that might have required surgery or being out for a long period of time."

Bush took a helmet to his knee midway through the second quarter of last weekend's 25-21 loss to the Arizona Cardinals.

He sat out most of the rest of the game and the Lions' offense struggled in his absence managing just 90 total yards and no offensive touchdowns in the second half.

Bush did not practice Wednesday. If he can't play Sunday the Lions will use a combination of Joique Bell Theo Riddick and Mikel Leshoure in his absence.

"I'm always optimistic to be able to play" Bush said. "I hate missing games. It pains me to miss practice. I hate missing practice because I feel like the reps are vital to your performance on Sunday.

"Like I said I'm optimistic to play Sunday but there's so many different things that need to happen. I've got to get approval from the doctors and coaches and trainers so I still have some work cut out for me."