Eller was removed from the ice on a stretcher during the second period of Game 1 of the Canadiens' Eastern Conference Quarterfinal series against the Ottawa Senators after he was hit by Ottawa's Eric Gryba.
The team announced Thursday that Eller had been hospitalized after sustaining a concussion, facial fractures, loss of consciousness and had teeth knocked out after the hit and falling face-first to the ice.
Gryba was assessed a five-minute major for interference and a game misconduct for the hit, and has been suspended for two games by the NHL Department of Player Safety.
Six teams are fighting for three spots at the 2013 MasterCard Memorial Cup, hosted this year by the Saskatoon Blades.
Leading those teams is a number of top 2013 NHL Draft prospects.
As NHL Network analyst Craig Button breaks down some of the top stars, among them defenseman Seth Jones of the Portland Winterhawks, NHL Central Scouting's top-rated North American skater, whose team will face Curtis Lazar and the Edmonton Oil Kings in the Western Hockey League final. The series begins Friday in Portland.
In the Ontario Hockey League, the London Knights will have forwards Max Domi and Bo Horvat and defenseman Nikita Zadorov leading them against the Barrie Colts. That series begins Friday in London.
And in the Quebec Major Junior Hockey League final, the Halifax Mooseheads boast an incredible array of talent, led by forwards Nathan MacKinnon and Jonathan Drouin, as well as Central Scouting's top-rated North American goaltender, Zachary Fucale. Their opponent in the league final, the Baie-Comeau Drakkar is led by forward Valentin Zykov. The series begins Friday in Halifax.
The Memorial Cup runs May 17-26, with the three league champions joining Saskatoon in the round-robin tournament to crown Canada's top junior team.
Backstrom sustained a lower-body injury during warm-ups prior to Game 1 of the Wild's first-round Stanley Cup Playoff series against the Chicago Blackhawks. Josh Harding started and made 37 saves in the Wild's 2-1 loss. The Wild have yet to update Backstrom's injury.