Rex Ryan: Joe McKnight hurt shoulder

New York Jets running back/kickoff returner Joe McKnight is a question mark for Saturday's game against the New York Giants because of a separated right shoulder, coach Rex Ryan confirmed Monday on his weekly spot on 1050 ESPN New York.

Complicating the matter is that McKnight's injury is on the same side as his hyperextended elbow, which caused him to miss one game this season.

"We'll have to see how he is through the week to see if he can play Saturday," Ryan said on "The Michael Kay Show." "I'm not real sure."

It's unclear when McKnight suffered the injury, but he played into the fourth quarter of Sunday's 45-19 loss to the Philadelphia Eagles. If McKnight can't play, Antonio Cromartie will return kickoffs. Cromartie had five of the six kickoff returns on Sunday.

McKnight, attending teammate Bart Scott's charity go-kart event at Pole Position Raceway on Monday night, said through a team spokesman that he preferred to not address the injury at that time because he was there with family for the event. His arm wasn't in a sling or appear noticeably hindered.

McKnight is the team's third-string running back, but as a kickoff returner he is averaging 32.3 yards a return, best in the league, and has a 107-yard touchdown. This is McKnight's second pro season.

Ryan said he expects running back Shonn Greene to be fine. After the game, Greene said "a tendon or something popped" in his pinkie finger.

Rich Cimini covers the Jets for ESPNNewYork.com. Information from The Associated Press was used in this report.