New England Patriots sign TE Clay Harbor, DT Terrance Knighton

The New England Patriots signed tight end Clay Harbor as an unrestricted free agent from the Jacksonville Jaguars and defensive tackle Terrance Knighton as an unrestricted free agent from the Washington Redskins, the Patriots announced Monday.

Harbor, 28, has played six seasons in the NFL, and in 2015, he played in 15 games with 14 starts and had 14 receptions for 149 yards and one touchdown for Jacksonville.

Harbor is the second tight end the Patriots have added in the offseason. They acquired Martellus Bennett in a trade with the Chicago Bears. The Patriots also have tight end Rob Gronkowski.

Knighton, 29, has played seven NFL seasons, and last season he played in 15 games for Washington, all as a starter, and recorded 29 tackles and 1.5 sacks. He started one postseason game and had one tackle.