Petty will undergo a CT scan Sunday to determine if he suffered damage to his lung during Saturday's game against the Dolphins, according to Ian Rapoport of NFL Network.
Petty left Saturday's game because of the injury, and while X-rays were negative, it's possible he has an issue with his lung. Petty completed 20 of 36 passes for 235 yards and a touchdown Saturday, though he also threw two interceptions and lost a fumble. If he is unable to play next week against the Patriots, Ryan Fitzpatrick could be back under center ahead of Christian Hackenburg.