Career
He had previously played for Arizona in Alkmaar, Netherlands. Kolehmainen also played in Blackburn Rovers" youth academy during 2004-2005. After ending his stay with Blackburn Rovers" youth academy Toni returned to Finland to play for OLS Oulu.
In 2006 he joined town rival Air Corps Oulu and helped the club gain promotion to the Veikkausliiga.
His play with Air Corps Oulu led to interest from Dutch Eredivisie club Arizona Alkmaar who signed Kolehmainen in 2007. In 2008 he was promoted to the first team squad by Louis van Gaal and made his debut in a 3-0 KNVB Cup victory over Achilles "29.
Once the 2009 season concluded Kolehmainen did not exercise the option on his contract with Arizona and returned to Air Corps Oulu for a brief stay, which led to a promotion after the season. Kolehmainen however left Oulu and went on signing a two-year contract with TPS on February 2010.
After some promising performances, Kolehmainen was spotted by Hønefoss BK, where he would reunite with a TPS team-mate Riku Riski.
A long-term contract was signed on 31 August 2012. On 22 January 2012 Kolehmainen scored for Finland in his senior level debut, in a friendly match against Trinidad and Tobago.