Ryan Fitzpatrick, who underwent an MRI on Monday, has been diagnosed with a sprained MCL in his left knee.
Todd Bowles said Fitzpatrick will start next week against the Rams despite his two-interception performance.
But Fitzpatrick's injury, although not considered serious, could impact that decision.
Bryce Petty replaced Fitzpatrick for four snaps on Sunday, completing both pass attempts and finishing off a drive that resulted in a field goal.