PITTSFORD, N.Y. -- Buffalo Bills guard Chris Williams left Thursday's practice early with a toe injury.
Williams, who signed a four-year deal with the Bills as a free agent this offseason, did not return to practice.
In his place, the Bills used a rotation of Cyril Richardson , Antoine McClain and J.J. Unga at left guard. Richardson saw time at right guard early in the practice, before Williams' injury.
The Bills were also without Chris Hairston , who left Wednesday's practice with a back injury. Hairston had been competing with Kraig Urbik for the starting right guard spot.
Tight end Lee Smith also missed Thursday's practice with a "lower body" injury. He joined top tight ends Scott Chandler (groin) and Tony Moeaki (hamstring) as those out of action, leaving only Chris Gragg and Dominique Jones healthy at the position.