Grigorenko rejoins the Sabres for the sixth time this season, while Buffalo demoted forward Tim Schaller and defenceman Chad Ruhwedel to Rochester, their American Hockey League affiliate.
Ruhwedel played in two games after being called up last weekend. He was sent back down with Andrej Meszaros set to return after missing two games with a hand injury.
Grigorenko, Buffalo's 2012 first-round draft pick, has a goal and assist in 13 games with the Sabres this season.
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