BUFFALO, N.Y. — Buffalo Bills quarterback Josh Allen has cleared the NFL's concussion protocol. 

The team made the announcement early Saturday morning, all but ensuring that the second year QB will play Sunday against the Tennessee Titans in Nashville. 

Allen was injured in the fourth quarter of last week's game against the New England Patriots, as the result of a helmet-to-helmet hit with cornerback Jonathan Jones. 

Allen spent six days in the concussion protocol, but was still listed as a full participant at Friday's practice. 

The team also announced that fullback Patrick DiMarco and safety Dean Marlowe also cleared the league's protocol, and are available for Sunday's game.

Saturday afternoon the Bills announced that they have activated wide receiver Duke Williams from the practice squad. He is expected to play Sunday against the Titans. 

RELATED: QB Allen clears concussion protocol

RELATED: Bills quarterback decision coming down to the wire

RELATED: Bills win would show they are legitimate AFC contenders