PITTSFORD, N.Y. (AP) The Buffalo Bills have signed free agent running back Bronson Hill to fill in for Boobie Dixon, who is sidelined with a pulled calf muscle.

Hill is an undrafted rookie who had 2,357 yards rushing and 11 touchdowns in 42 games at Eastern Michigan. The Bills released defensive end Erik Williams to make room for the signing announced Thursday.

Hill was added to spread out the load of carries during training camp. Dixon is expected to miss at least a month after he was hurt Monday.

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Starter LeSean McCoy had a sore toe that limited him to individual drills for two days before returning to full practice Thursday.

Veteran Fred Jackson, Bryce Brown and rookie fifth-round pick Karlos Williams round out the team's group of running backs.

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