TSN is reporting Frattin had a flare-up of MCL issues requiring a procedure on his knee.
Frattin has been a revelation for the Maple Leafs during their fast start, posting seven goals and 10 points in 10 games. He had the game-winning goal Monday night against the Philadelphia Flyers.
Tuesday, the Maple Leafs announced goaltender James Reimer also will miss at least a week with an MCL strain suffered Monday against the Flyers.
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