The Patriots have released defensive end Justin Francis, linebacker Ja'Gared Davis and defensive back Kanorris Davis, according to a league source.

The news on Francis comes as a surprise, as he had developed into a rotational defensive end last season after making the roster as an undrafted free agent out of Rutgers. He was recently limited by an undisclosed injury in training camp. He recorded three sacks during his rookie season.

The Patriots now have starters Chandler Jones and Rob Ninkovich on top of the depth chart, with rookie Michael Buchanan and 2012 third-round draft choice Jake Bequette behind them.

As for Ja'Gared Davis, an undrafted free agent out of SMU, he was claimed by the Patriots off of waivers earlier this week. He has practice-squad eligibility.

Kanorris Davis, another undrafted free agent, has worked as a reserve safety throughout training camp. He, too, has practice-squad eligibility.

All three players will be subject to the NFL's waiver system.