Fortunately, it doesn't appear as if the injury is serious, with Clay saying he's "100 percent fine."
"I'm fine," he said after practice, via Mike Rodak of ESPN. "It was just something that they wanted to look out for me a little bit. It was something that started nagging, so they decided it would be best to pull me out."
Clay signed a five-year, $38 million contract with the Bills this offseason and projects to play a big role for Buffalo this season. He hasn't performed the way many expected, but he'll still be the team's No. 1 tight end for the regular season. Last season, Clay was hampered by a right knee injury. When asked if he injured the same knee on Tuesday, he was reluctant to comment, the story went on to say.