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The Steelers have a very fluid situation behind Ben Roethlisberger. All three of their quarterbacks are free agents, and there's a sentiment that none of them will return. The most likely to do so seems to be longtime backup Charlie Batch.
To remedy the situation, the Steelers signed former Baltimore Raven and Heisman Trophy winner Troy Smith, but there's no guarantee that Smith, who's accuracy has never impressed, will stay.
McElroy spent last season on injured reserve for the Jets, but he could be available now. He had some negative things to say about the Jets' locker room and the belief is that the team will make room for a veteran backup for Mark Sanchez.
McElroy would fit better than Smith into what the Steelers do with their quarterbacks, and he's young enough to be developed as a long-term backup behind Roethlisberger.