This was also his last year in HJK as he signed to a Swedish club GAIS after a tip off from former Finland national team coach Roy Hodgson as a bosman.

In the end GNK Dinamo Zagreb went to the Group Stage of the tournament by only one goal marginal, as they first won home 4–1 but then lost 2–0 in Malmö.

Malmö still qualified to the Europa League in the same group as AZ Alkmaar, FC Metalist Kharkiv and FK Austria Wien.

After the summer break, manager Rikard Norling decided that he wanted to play Halsti as a central midfielder, a position where the team needed reinforcement.

Halsti scored the only goal of the game in the last minutes of the first half in the home fixture against title contender AIK on 11 August 2013.

For the 2014 season Halsti sporadically captained Malmö FF and was officially selected to the Allsvenskan Team of the Year.

[7] Halsti missed the first several months of the 2015 MLS season due to a knee injury, before making his debut in an away loss to the Philadelphia Union on 17 May 2015.

Halsti also started all three of United's matches in the 2015 MLS Playoffs and made three appearances in the club's successful advancement from the group stage of the 2015–16 CONCACAF Champions League.