San Jose general manager Doug Wilson announced the move Wednesday, ahead of the team's home game against the Dallas Stars. The Sharks had lost four of their last five.
Rau has one goal and six assists in 33 games this season for the AHL's Iowa Wild. He has two goals in nine career NHL games for Minnesota. He will report to the Worcester affiliate.
Gogol recorded four points and 149 penalty minutes in 40 games with Worcester.
Worcester also traded right wing Riley Brace to the Iowa Wild.
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