He was signed under the influence of General Manager Jarmo Kekalainen, who previously drafted Hjalmarrson whilst as a scout for the St. Louis Blues.

[2] After attending the Blue Jackets training camp for the 2014–15 season, Hjalmarsson failed to make an impression with the club and was initially reassigned to American Hockey League affiliate, the Springfield Falcons on October 3, 2014.

[3] With little interest to play North American minor league hockey, Hjalmarsson was placed on unconditional waivers in order to mutually terminate his contract with the Blue Jackets.

On October 15, 2014, Hjalmarsson signalled an intent to play in the KHL when his rights were traded by his draft team, HC Sibir Novosibirsk to CSKA Moscow.

[4] Hjalmarsson returned to Sweden after the end of the 2015–16 season, signing for a second time with Frölunda HC of the Swedish Hockey League (SHL).