Career
He has played as a left winger most of his career, but can also play on the right wing. Kolkka started his career with Reipas Lahti and MyPa in Finland"s Veikkausliiga. Kolkka then moved to Greek side Panathinaikos in 2001, and he spent two seasons there.
After leaving Greece, Kolkka played a season each for Borussia Mönchengladbach of the German Bundesliga and Crystal Palace of the English Premiership.
He scored at both Anfield and Old Trafford during his stay at the club, and also scored in the thrilling 3–3 draw with Norwich. He was released by Palace, and returned to the Netherlands in 2005, signing a one-year deal with ADO Den Haag.
After an impressive season with ADO, he was signed by Dutch side Feyenoord in the summer of 2006, and played until summer 2011 for NAC Breda. In 2011 he was signed by his former club, Willem II, being employed as a player and a sales manager of the club
On 4 May 2012, it was announced that Kolkka had signed a three-month-contract with Texas Dutch Lions, in the third level of American football (not Dayton Dutch Lions).
After his contract with the Dutch Lions expired, Kolkka returned to the Netherlands, working as a youth coach for his former club PSV.
Kolkka made his debut for the Finnish national team on 26 October 1994 against Estonia, and was a regular in the Finland lineup until 2010.