He was forced to miss San Jose's game against the St. Louis Blues on Saturday, Thornton's first missed game since November 2010. He had played in 319 consecutive games.
The 35-year-old has nine goals and 24 assists this season for 33 total points, tied for the team lead with Joe Pavelski. He's in his 10th season with San Jose.
The Sharks also on Sunday assigned forward Micheal Haley to AHL affiliate Worcester.
San Jose is 20-14-5 this season and tied for fourth place in the Pacific Division.
- Ben Estes