FOXBOROUGH, Mass. - The New England Patriots announced that they have signed TE Clay Harbor as an unrestricted free agent from the Jacksonville Jaguars and DT Terrance Knighton as an unrestricted free agent from the Washington Redskins. Terms of the contracts were not announced. 

Harbor, 28, is a veteran of six NFL seasons with the Philadelphia Eagles (2010-12) and the Jacksonville Jaguars (2013-15). The 6-foot-3, 250-pounder, originally entered the NFL as a fourth-round draft pick (125th overall) by Philadelphia out of Missouri State in 2010. He has played 83 NFL games with 36 starts and has 111 receptions for 1,151 yards and eight touchdowns. Harbor also started in one postseason game in 2010 with Philadelphia. After being released by Philadelphia on Aug. 31, 2013, Harbor was claimed off waivers by Jacksonville on Sept. 1, 2013. Last season with Jacksonville, he played in 15 games with 14 starts and finished with 14 receptions for 149 yards and one touchdown. 

Knighton, 29, is a veteran of seven NFL seasons with the Jacksonville Jaguars (2009-12), Denver Broncos (2013-14) and the Washington Redskins (2015). The 6-foot-3, 354-pounder, originally entered the NFL as a third-round draft pick (72nd overall) by Jacksonville out of Temple. He signed with Denver as an unrestricted free agent in 2013 and with Washington as an unrestricted free agent in 2015. Knighton has played in 108 NFL games with 96 starts and has 230 total tackles, 14 sacks, two interceptions, 11 passes defensed, three forced fumbles and two fumble recoveries. He has also started in five postseason games, including Super Bowl XLVIII with Denver, and has notched 12 total tackles and one sack. Last season with Washington, Knighton started in all 15 regular-season games that he played and registered 29 tackles and 1½ sacks. He also made one start in the postseason, finishing with one tackle.