Buccaneers CB Carlton Davis (toe) out against Bears

TAMPA, Fla. -- Tampa Bay Buccaneers top cornerback Carlton Davis will not play in Sunday's game against the Chicago Bears because of a toe injury.

Davis, Tampa Bay's most experienced cornerback, did not practice all week before being ruled out Friday.

Second-year cornerback Zyon McCollum, who got in a lot of reps in training camp with the first-team defense, will step into Davis' role.

"He's ready to play. We've got all the confidence in the world in him," Bowles said of McCollum. "He had a great summer, he had a great spring. He's practicing [well]. We don't have a problem playing him."

Bowles did say he is hopeful that starting nickelback Christian Izien, a rookie who had a touchdown-saving interception in last week's 20-17 win at the Minnesota Vikings, can play Sunday. Izien is in the concussion protocol and Bowles said he still had some tests to clear, but he returned to practice in a limited capacity Thursday before being a full participant Friday.

Izien is listed as questionable for Sunday's game. Defensive tackle Calijah Kancey (calf) and inside linebacker SirVocea Dennis (hamstring) were ruled out.