Kevin Kolb left Saturday's preseason game and is being evaluated for a possible head injury. Kolb finished the second series before being taken to the locker room for further tests. He appeared to be knocked in the back of the head on a first-quarter scramble, and the Bills later announced that Kolb is suffering from concussion-like symptoms. Undrafted rookie Jeff Tuel replaced Kolb in the lineup and will play the rest of the game, being he's the only healthy quarterback.