Malkin (upper body) was activated from injured reserve Tuesday, per the NHL media site.
Pittsburgh assigned Jesse Puljujarvi to AHL Wilkes-Barre/Scranton in a corresponding move. After missing the last four games, Malkin will return to the second line and second power-play unit versus Seattle on Tuesday. He has amassed eight goals, 32 points, 71 shots on net, 29 blocked shots and 20 hits across 41 appearances this season.