Bills' Allen still in concussion protocol

Buffalo Bills quarterback Josh Allen's availability for Sunday's game against the Tennessee Titans is in doubt as he remains in concussion protocol, head coach Sean McDermott announced Friday.

However, the coach said he would be comfortable starting Allen if he clears protocol, according to Bills insider Chris Brown.

Allen was injured on a helmet-to-helmet hit in his team's Week 4 loss to the New England Patriots. He was replaced by Matt Barkley.

The sophomore quarterback has completed 60% of his passes for 903 yards, three touchdowns, and six interceptions in four games this season. He's also rushed for three touchdowns and lost two fumbles.