CINCINNATI (AP) — Trey Hendrickson was placed on injured reserve by the Cincinnati Bengals on Thursday, ending his season.

The All-Pro defensive end will undergo core muscle surgery. He has missed six games this season, including the last five, due to a hip/pelvis injury.

The move to injured reserve finishes a frustrating season for Hendrickson, who led the NFL with 17 1/2 sacks last season. He is in the final year of a restructured contract worth $29 million after holding out during training camp.

In seven games this year, Hendrickson had 16 tackles and four sacks.

Without Hendrickson, Cincinnati has only 21 sacks, fourth-lowest in the league. The Bengals defense is also ranked near the bottom of the league in most categories going into Sunday’s game against Baltimore.

Hendrickson is

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