ORCHARD PARK (AP) — The Buffalo Bills have signed defensive tackle Corey Liuget to a one-year contract in a bid to shore up their run defense.

Liuget, 6-foot-2 and 300 pounds, appeared in three games with Oakland this season before his release last week. He was drafted by the Chargers in the first round in 2011 and spent eight seasons with them.

His signing Tuesday comes with Buffalo having allowed 556 yards and six touchdowns rushing over its past four games. The Bills allowed only 338 yards and three TDs in their first four. The downturn coincides with a season-ending knee injury to defensive tackle Harrison Phillips.

The Bills freed a roster spot by placing linebacker Maurice Alexander on injured reserve because of knee and calf injuries.

Buffalo (6-2) plays at Cleveland (2-6) Sunday.