The Maple Leafs' captain was injured Saturday night during Toronto's 4-3 loss at the Ottawa Senators when he took a shot off the ankle.
"I'm surprised by it," Sundin said prior to the Maple Leafs' game Monday night against the Nashville Predators.
"It was on a 3-on-2 and (Magnus) Arvedsson was going wide and I went wide with him. He dropped a pass and I stopped. I think it was (Marian) Hossa, who took a one-timer."
It was initially thought Sundin only had a bruised foot, but he didn't practice Sunday and had a series of X-rays Monday morning, when the nondisplaced break was discovered. No surgery is required.
"Any time you get hurt you're not pleased," Sundin said. "There's a first for everybody. I've been fortunate in my career not to get hurt so we'll have to see."
The nine-year NHL veteran had played 259 consecutive games, the second-longest active streak in the league. The 6-foot-5 native of Sweden was off to a great start this season, leading the Maple Leafs to a 3-1-0 record with three goals and four assists.
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