Top Finnish prospect Jesse Puljujarvi underwent left knee surgery after the World Under-18 Hockey Championship in late April, according to Sportsnet's Damien Cox.
Puljujarvi was restricted to upper-body workouts at the NHL Draft Combine as a result, Cox added.
Finland won the Under-18 tournament in Grand Forks, N.D., and Puljujarvi had a hat trick in the gold medal game against Sweden. He finished with five goals and two assists in four games.
He is expected to go third overall at the draft, after Auston Matthews and fellow countryman Patrik Laine.
The winger had himself a World Junior Hockey Championship to remember, as well, recording 17 points in seven games as Finland won the tournament on home soil. He turned 18 on May 7.
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