Thornton hasn't played since injuring his right knee against the Winnipeg Jets on Jan. 23. He had surgery to repair his right medial collateral ligament.
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Defenseman Brent Burns (undisclosed) missed his second consecutive practice but skated with assistant coach Rob Zettler beforehand. Burns missed the final 10 minutes of Game 3 in the first round but had an assist in Game 4 to help the Sharks to a four-game sweep of the Anaheim Ducks.
"Maintenance day," DeBoer said. "He'll be fine."
Burns led the Sharks in points (67), assists (55) and shots (332) while scoring 12 goals during the regular season. He had had one goal and one assist on 15 shots against the Ducks.
"He can take a month off and come out and still be great," Sharks defenseman Justin Braun said. "He'll be fine."
Burns hasn't missed a game since the 2013-14 season, when he sat out 13 with sore gums. Sharks defenseman Brenden Dillon said he's not concerned.
"I think it's nice having a week here for guys with some bumps and bruises," Dillon said. "I think collectively everyone's maybe dealing with something here or there, but I think Burns will be fine. We still got another four or five days before the game so I'm sure he'll be ready. He always seems to be in good shape whether he's playing or not. I don't think it's an issue."
Fourth-line forward Melker Karlsson also missed practice and had a maintenance day. Jannik Hansen skated in his spot.
