Sam Bradford said the knee injury he sustained in Week 1 was not due to contact.

"I felt it when it happened," Bradford said. "I honestly didn't think it was that big of a deal, and then the longer the game went on, it started to feel just a little bit worse and a little worse. Woke up Tuesday, and it just didn't feel very good."

Bradford said he has a clear indication of what the injury diagnosis but wouldn't divulge the nature or severity.

Bradford was inactive for Week 2.

Bradford tore the ACL in his left knee in 2013 and again in 2014.