Caussin was designated as waived/injured after he was hurt during practice on Aug. 2. The second-year player has had little luck since playing six games with Buffalo in 2011. He missed all of last season because of a knee injury.
The Bills said Thursday they've retained Caussin by rolling over the final year of his contract. He missed last season while recovering from right knee surgery. Buffalo acquired Caussin in December 2010 by signing him off Jacksonville's practice squad. He has five catches for 41 yards in six games with Buffalo.