The Sharks have activated Marc-Edouard Vlasic from injured reserve, the team announced Sunday.
The 27-year-old has missed the last four games with an undisclosed upper body injury that is not a concussion, according to coach Todd McLellan.
Vlasic, who skated with fellow injured defenseman Justin Braun on Friday, returned to practice with his teammates on Saturday.
The Sharks have gone 1-2-1 in their last four games without their best defenseman.
In a corresponding move, General Manager Doug Wilson announced that the club has reassigned defenseman Dylan DeMelo to the Worcester Sharks (AHL).
DeMelo, 21, has registered 13 points (3-10=13) and 14 penalty minutes this season with the Worcester Sharks. Last season with Worcester, DeMelo posted 24 points (2-22=24) in 68 games, finishing first amongst all Worcester defensemen in points and assists.
In 120 career games with the Worcester Sharks, DeMelo has posted 42 points (5 goals, 37 assists) and 73 penalty minutes. The six-foot-one, 195-pound native of London, Ontario, was originally selected by the Sharks in the sixth round (179th overall) of the 2011 NHL Draft.
The Sharks media services contributed to this report