Thornton, who turned 38 Sunday, had 50 points (seven goals, 43 assists) with the Sharks last season, his fewest in a full season since he had 41 with the Boston Bruins in 1998-99. He had two assists in four Stanley Cup Playoff games and revealed after the postseason he had been playing with a torn ACL and MCL.
"I haven't trained my legs like this ever in my career, so my legs are going to be stronger than ever, to be honest with you," Thornton said.
On March 6 against the Winnipeg Jets, Thornton became the 13th player to reach 1,000 assists in the NHL. He is the Sharks' all-time leader in assists (722) and rating (plus-181), is second in games played (914) and points (937), and is third in goals (215).
Thornton, selected by the Bruins with the No. 1 pick in the 1997 NHL Draft, was traded to San Jose from Boston on Nov. 30, 2005. In 81 games with the Sharks and Bruins in 2005-06, he had 29 goals and led the League with 96 assists and 125 points, winning the Hart Trophy as League MVP.
Thornton, who had 21 points (three goals, 18 assists) in 24 playoff games in 2016 to help the Sharks advance to the Stanley Cup Final, has played in 1,446 NHL games (tied for 26th) and has 1,391 points (tied for 22nd), 384 goals and 1,007 assists (13th).
"Joe has become one of the faces of this franchise since his arrival in 2005 and we feel it's only fitting that he will be wearing teal going forward," Wilson told the Sharks website. "He is a generational playmaker and his accomplishments place him amongst the elite players to ever play the game. He has helped lead this team to new levels and continues to be one of the top two-way centers in the League. His leadership on and off the ice have been instrumental in this franchise's success, and we're excited that he has continued his commitment to this organization and the fans in San Jose."