ORCHARD PARK, N.Y. (AP) Buffalo Bills running back Cierre Wood will miss the remainder of the season because of a knee injury.

And the Bills filled Wood's roster spot on Monday by activating defensive end Ikemefuna Enemkpali, who finished serving a four-game suspension for violating the NFL's player personal conduct policy. Enemkpali was suspended for a punch that broke the jaw of New York Jets quarterback Geno Smith during a locker room altercation in Aug.

The Bills, who claimed Enemkpali on waivers, were granted a one-week roster exemption and had until Monday to activate or cut the player.

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Wood was placed on injured reserve after he was hurt in Buffalo's 14-13 win at Tennessee on Sunday.

Starting running back LeSean McCoy (hamstring) is out indefinitely. Backup Karlos Williams (concussion) has a chance to return Sunday, when Buffalo (3-2) hosts Cincinnati (5-0).

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AP NFL website: www.pro32.ap.org and http://twitter.com/AP-NFL