PITTSFORD, N.Y. (AP) -- Buffalo Bills quarterback Kevin Kolb has been escorted into the locker room after he slipped on a rubber mat and hurt his left knee during practice.
Kolb, competing with first-round draft pick E.J. Manuel for the Bills' starting job, was switching fields with his offensive teammates.
As he ran, Kolb slipped on a wet rubber mat and stumbled awkwardly at the Bills training camp facility in suburban Rochester on Saturday.
Though Kolb did not fall, he had trouble standing and put his arm around the shoulder of head trainer Bud Carpenter. Kolb then tossed down his helmet in frustration, before sitting down on the field.
Carpenter briefly examined Kolb's knee before escorting him to the locker room. Workers then began sweeping water off the mats.
Bils head coach Doug Marrone says the injury isn't serious and he expects the quarterback to return to practice. Kolb is listed as day to day.
Associated Press sportswriter John Wawrow saw it happen and described the incident to Two On Your Side's Stu Boyar. "Essentially I was just following the team as the offensive players as they were moving over to Growney Stadium Field as they usually doing during practice for individual one on one receiving drills. All of a sudden I looked up and I see someone stumble in front of me wearing the quarterback red jersey and all of a sudden I see him leaning across Bud Carpenter, fortunately the Bills head trainer, was walking right nex to Kevin Kolb. And Kolb immediately looked like he was in pain. He put his arm right around Bud Carptenter's shoulder and it looked like he was limping. Cleary he was hurt and slipped. He never went to the ground. I'm not sure if that's good or bad because it looks like he planted his left foot and maybe that's what caused his left knee maybe to just give a little bit."