On 8 March, he made his official debut for Stabæk in the 2009 Super Cup where the league champions won 3-1 against cup champions Vålerenga, with Kobayashi playing an important part, getting on the score-sheet with a free kick and showing trickery with the ball.
On 27 January 2010, Kobayashi signed on a free transfer to the Greek team Iraklis Thessaloniki for 18 months [REF].