The Buffalo Bills' IK Enemkpali, released this week by the...

The Buffalo Bills' IK Enemkpali, released this week by the New York Jets, speaks to the media at training camp, Thursday, Aug. 13, 2015, in Pittsford, N.Y. Credit: AP / Mike Groll

ORCHARD PARK, N.Y. -- 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.

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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