2008-09: Played for the Blues’ U-18 Junior "B" squad. In 23 games, he scored 11 goals and added 23 assists for 34 points.
2009-10: Spent most of the season with the Junior "A" Blues. In 37 games, Halinen scored 6 goals and added 11 assists for 17 points. Part of Team Finland for the U-18 World Junior Championships. In 6 games, Halinen scored 1 goal.
ISS in April 2010: "A versatile and rangy two-way forward, Halinen was relegated to role player for Finland during the U18 tournament and as valuable as he was to the team was not able to gain the exposure he could have used to vault himself into being an NHL draft pick. Halinen now looks poised to be a player who can continue to develop in Europe and possibly gain entry to the North American pro ranks by the road less traveled. With that being said, his value and potential did not go completely unnoticed and he could still find himself as a late-round pick for an ambitious NHL team."