It's over for William Nylander.

See how the Leafs' prospect his feeling.

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It's over for William Nylander, he won't be playing in the World Junior Hockey Championships anymore.

The Maple Leafs' prospect has been ruled out for the rest of the tournament by Sweden and he will immediately fly back to Toronto, according to the International Ice Hockey Federation.

Nylander left the game between Sweden and Switzerland after being hit to the head by Swiss' Chris Egli on December 26 and hasn't played yet. He likely suffered a concussion, but the IIHF claims that it is a head injury and does not give more details.

Sweden is still favourite to win the Gold medal despite William's absence as his brother Alex is leading their country and has yet to face any stiff opposition.

William Nylander is still ranked second in the AHL, despite leaving for Finland, with 35 points in 27 games. He is the future of the Toronto Maple Leafs' organization.