Leonhard was helped to the sideline with a right knee injury during the second quarter and then carted into the locker room. He was injured after making an interception and being tackled by Chiefs receiver Steve Breaston. Jets coach Rex Ryan said was hopeful after the game, but admitted he had not received an update from doctors.
"I'm hopeful it's not that bad, but it's never good when you need help coming off (the field)," Ryan said.
In 2010, Leonhard broke his right leg in a collision with teammate Patrick Turner during practice in early December and missed the remainder of the season.
Revis said Sunday he had not spoken with Leonhard nor heard any official word on the injury.
"Injuries happen throughout the season," Revis said. "It's just a weird moment of this repeating again and Jim maybe out again."