The injured foot of Buffalo Bills defensive end Mario Williams seems to be a growing concern.
He sat out Sunday's practice because of that injury, and on Monday, he left training camp to have the foot examined.
"He's going to be evaluated by our doctors, so he's off campus being evaluated," head coach Doug Marrone said, according to The Buffalo News. "I have not heard any report yet.
"His foot was sore. We're not going to make any mistakes about it. We're going to make sure that everything's fine. Our doctors are evaluating him. Where he is or where he goes, I'm not going to talk about that."
Williams is entering the second year of his $96 million contract. He had 10.5 sacks for the Bills last season.
Defensive coordinator Mike Pettine had said he planned to move Williams all over the field to make it more difficult for opposing offenses to key on him.