Djurgarden has also confirmed the agreement to the Swedish media.
However, LeBrun believes last season's Calder Trophy winner as NHL rookie of the year will extend his contract with Djurgarden if the lockout drags on longer than two months.
Landeskog, 19, had received multiple offers from several clubs overseas since the start of the lockout two weeks ago.
In 82 games with the Avs last season, Landeskog collected 22 goals and 30 assists for 52 points