Thornton said he's excited to skate with Pavelski, his longtime linemate, and Kane, who came to the Sharks in a trade with the Buffalo Sabres on Feb. 26.
"I think for me being a passer, to have the luxury of passing to two goal-scorers, it's something you enjoy and you look forward to coming to the rink because you know you have two finishers on your line," Thornton said.
Pavelski moved from right wing to center on the top line last season after Thornton was injured.
"Really excited," Pavelski said of skating with Thornton and Kane. "There will be a few things we'll work through throughout training camp and try to figure out. Even today, stepping back on the ice, all the things that [Thornton] and I have been able to do, it felt very similar. Didn't miss a beat."
Kane said, "I think [Thornton's] obviously a legend who's actively playing, which is rare in this league. It's great to see him back on the ice."
Defenseman Erik Karlsson, acquired by San Jose from the Ottawa Senators in a trade Thursday, is dealing with work visa issues and missed the first day of camp. The Sharks don't expect him to report until next week.
"I communicated with him today," DeBoer said. "It's all immigration based. He was trying to speed it up."
Forward Melker Karlsson (upper body) has yet to be cleared for contact and skated with the third group.