The Canada and D.C. United talisman suffered a sprained MCL in a World Cup qualifier in Panama on Tuesday.
D.C. United, De Rosario's club team, announced the expected recovery time on Thursday, confirming an early prognosis given by Canada's medical staff immediately after the match in Central America.
The loss of the 34-year-old hurts both D.C. and Canada, as both teams are in a crucial phase of their respective campaigns, and each side looks to De Rosario as an offensive catalyst. He is the reigning Major League Soccer MVP and also holds the all-time Canadian men's national team goalscoring record.
“DeRo is our captain, a great player and impossible to replace,” D.C. head coach Ben Olsen said in a statement. “With that said, we have talented players that will step up in his absence and this injury will not be an excuse to fall short of goals we set for ourselves as a team at the beginning of the season.”
D.C. United, currently in sixth place in the tightly contested Eastern Conference playoff race, plays its next game on Saturday night against New England, while Canada's next match is a virtual must-win at home to Cuba on Oct. 12.