Thornton tore the ACL and MCL in his knee on April 2 in Vancouver but still returned to play San Jose's final four playoff games in a first-round loss to Edmonton. The Sharks say Thornton will have the operation Monday and there is no timetable for when he will be healthy again.
The 37-year-old Thornton can become an unrestricted free agent this summer, putting his future in San Jose in question. He has been the face of the Sharks, along with fellow 37-year-old pending free agent Patrick Marleau. Both players said at locker clean out day that they would like to return.