AP

ORCHARD PARK, N.Y. (AP) — The Buffalo Bills have promoted cornerback Greg Mabin from the practice squad and released receiver Philly Brown, four days after signing him.

Cutting Brown leaves the Bills with just four healthy receivers for their game at Cincinnati on Sunday. Starter Jordan Matthews was already ruled out after breaking his thumb last weekend.

Bills turn to untested group of wide receivers

Mabin's promotion to the active roster comes with the Bills listing three defensive backs as questionable to play. Starting cornerback E.J. Gaines is nursing a groin injury, while backup Shareece Wright has a back injury. Staring safety Micah Hyde is dealing with a knee injury.

Mabin was cut by Buffalo two days after its season opener last month and then re-signed to the practice squad a few days later.