Seau, 37, would play inside linebacker for the Patriots, solidifying a unit that has been beset by injuries and free agency losses.
"I can play and there are teams out there that had interest, but they just didn't need (me)," Seau said at his farewell party at Chargers Park. "They wanted me, but they didn't need me. I'm not a player than can play by just wanting to play the game. I'm a guy that needs to win, and they go hand in hand."
The future Hall of Famer appeared in 230 regular season games, including a team-record 200 as a Charger – a record he currently shares with Chargers Hall of Famer tackle Russ Washington. This total ranks sixth in NFL history among players whose primary position was linebacker. During his 13 seasons in San Diego, he racked up 1,396 tackles, 45.5 sacks and 14 interceptions. He was the team leader in tackles in eight of his 13 seasons, averaging 116 tackles a year. Junior led the Bolts in tackles in 84 of the 200 games he played for the Chargers and has recorded 10 or more tackles 47 times.