Titans coach Mike Munchak targeted Callahan as a possible replacement for fired offensive coordinator Mike Heimerdinger. But because Callahan is under contract, the Jets had the ability to block the move.
Callahan, according to a source, wouldn't mind becoming an offensive coordinator again because it would enhance his chances of getting another head coaching position.
Callahan was head coach for the Oakland Raiders and the University of Nebraska. He coaches the Jets offensive line and helps build the running offense.
John Clayton is a senior writer for ESPN.com.