FLORHAM PARK, N.J. - The New York Jets' wacky quarterback situation took yet another twist. Greg McElroy has a concussion - which he didn't reveal until yesterday - and will be replaced by Mark Sanchez as the New York Jets' starting quarterback in the season finale at Buffalo on Sunday.

Coach Rex Ryan walked into his news conference before practice, took the podium and opened with: "You're not going to believe this."

McElroy, preparing to make his second NFL start in place of the benched Sanchez, was lifting weights yesterday morning and started experiencing headaches, Ryan said. McElroy went to the team's training staff and then revealed he was suffering concussion-like symptoms after being sacked 11 times in the Jets' 27-17 loss to San Diego last Sunday.

McElroy and head trainer John Mellody then went to Ryan to tell the coach the news.

"We come to find out that Greg wasn't exactly truthful with our training staff after the game," said Ryan, who acknowledged he was "stunned" to hear it. "He never disclosed that he had symptoms after the game to our trainers." Ryan said there was no way he would play McElroy against the Bills.