Arizona Cardinals quarterback Kevin Kolb left late in the fourth quarter of Sunday's 19-16 overtime loss to the Buffalo Bills.
With just over two minutes to play, Kolb fell forward on a run as two Buffalo players landed on him.
He lay on the field for several minutes and the cart was brought out, but he walked to the sideline under his own power.
John Skelton took over and led the team to the tying field goal. Arizona had a chance late in regulation to take the lead, but Jay Feely, who booted a career-high 61-yarder to tie the game, hit it off the left upright and Buffalo won in overtime.
It was later reported that Kolb suffered a chest/rib injury and he will have x-rays either later on Sunday or Monday.