St Louis Rams quarterback Kellen Clemens has insisted that he will be ready to play if the injury to first-choice Sam Bradford is as serious as expected.

Bradford will reportedly miss the remainder of the season after tearing the ACL in his left knee during the final quarter of yesterday's 30-15 loss to the Carolina Panthers.

The injury leaves Clemens as the Rams' only fit quarterback on either the active roster or the practice squad, and he has vowed to be ready to answer the call should it come his way.

"I think we're all talking about 'ifs' right now. Obviously, if called upon this week after a week of practice and an opportunity to work with the guys, we'll be ready to go," ESPN quotes Clemens as saying.

The Rams are currently third in the NFC West and will face divisional rivals the Seattle Seahawks next Monday.