Cherrington, 22, originally signed with the Patriots as a rookie free agent out of Mississippi State on May 3, 2013. The 6-foot-3, 335-pounder began his college career at Holmes (Miss.) Community College where he was a two-way standout before walking on at Mississippi State. He earned a scholarship in his final year in 2012.
Kafka, 25, signed a future contract with the Patriots on Jan. 21, 2013. He was originally a fourth-round draft pick (122nd overall) by Philadelphia out of Northwestern in the 2011 NFL Draft. He played in four games as a rookie, completing 11 of 16 passes for 107 yards. The 6-foot-3, 225-pounder, was released by Philadelphia on Aug. 31, 2012, and spent the season out of football.