[1] After retiring from TPS in 2018, Kallio remained with the team and assumed the role of director of European scouting.

He then moved to the National Hockey League with the Atlanta Thrashers who claimed him from Colorado in the 1999 NHL Expansion Draft.

He spent two seasons in Atlanta before he was traded with Pauli Levokari to the Columbus Blue Jackets for Petteri Nummelin and Chris Nielsen.

On 19 January 2009, Kallio extended his contract with Frölunda HC by two years.

On 22 July 2015, Kallio opted to return home to his original club, TPS of the Finnish Liiga on a one-year deal.