The 20-year-old Hertl was a strong Calder Trophy candidate with 15 goals and 10 assists in his first 35 games.
Victor Decolongon/Getty Images
The Sharks haven't speculated on exactly how long Hertl will be sidelined, but he is expected to miss more than a month, jeopardizing his chances to play for the Czech Republic at the Sochi Olympics in February.
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