Jay Cutler left in the third quarter of Monday night's 29-14 loss to the Philadelphia Eagles with an injury to his right thumb and did not return.

Cutler wore a protective cast on his right hand at the postgame news conference. He will undergo further tests Tuesday.

"I'm concerned," he said. "As a quarterback, you need your right thumb."

Cutler said he aggravated the thumb injury earlier in the game and "couldn't really grip the ball," which he said contributed to him to throwing an interception with 36 seconds left in the third quarter.