If chosen in the first round Swedish born players can play in the AHL as 18-19 year olds (like Nylander and Liljegren).
Those Swedish born players chosen after the first round of the draft have only two options either play in the NHL or in Sweden.
Grundstrom turned 20 in December so I expect he will be brought over to play in the Marlies Calder Cup run as long as his season in Sweden has ended.
this is what I was talking about @Joey Hoser. As a non 1st round pick Grundstrom had 2 options