Lions tailback Reggie Bush said after Sunday's loss against the Arizona Cardinals that he will undergo an MRI on Monday for his injured left knee. He is expected to receive a battery of tests, although he maintains the injury is not severe. He was seen walking around the locker room after the game without crutches or a limp. "I'm not too concerned," Bush said after the heart-breaking 25-21 loss. "I think I'll be all right. I'll do whatever it takes to get back on the field Sunday, even if I have to rehab 24 hours a day." Bush sustained the injury in the second quarter and was forced from the game. He said he took a helmet to the knee, although replays suggest it was Tony Jefferson's shoulder. Source: MLive.com