The injury occurred late in the third period when Oilers forward Zach Hyman fell on Forsberg’s leg in front of the net seconds before Ryan Nugent-Hopkins scored to give Edmonton a 6-3 lead.
Forsberg stayed lying on the ice, appearing to be in serious pain, clutching his right knee while awaiting a stretcher. Rookie goalie Mads Sogaard came in to replace Forsberg for the final minutes of Ottawa’s loss.
The 30-year-old Forsberg has a .902 save percentage in 28 games this season. Last season, he backstopped the Senators with a .917 save percentage, earning him a three-year, $8.25-million extension.
The Senators also lost defenceman Jake Sanderson to injury after receiving a hit from Oilers defenceman Vincent Desharnais earlier in the third period. Sanderson, who scored in the game, is having a strong rookie season with four goals and 18 assists in 52 games.
Head coach D.J. Smith did not have an update on either player’s status post-game.
With Forsberg out, the Senators are now without the tandem they assembled in the off-season, as fellow netminder Cam Talbot is out with a lower-body injury.
Talbot, 35, has played in 27 games this season, recording a 11-13-1 record in 24 starts along with a 2.95 goals-against average and .903 save percentage. The Senators acquired the netminder from the Minnesota Wild in exchange for Filip Gustavsson during the offseason.