The move will further strengthen the defending champions and was announced by the Swedish hockey association on Saturday after the Predators were eliminated from the NHL playoffs by the Winnipeg Jets.
Forsberg was leading scorer for the Predators in the regular season with 64 points for 26 goals and 38 assists. Arvidsson was second with 29 goals and 32 assists for 61 points. Ekholm had 34 points for 10 goals and 24 assists.
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Forsberg finished the playoffs with 16 points, Arvidsson had nine and Ekholm eight.
Sweden has won its first five games in Group A and next faces Switzerland on Sunday.