On 28 July 2008, he signed a five-year contract with Empoli,[2] using the Webster ruling to leave Wisla.

Wisla brought the matter to FIFA but in October the organization cleared Kokoszka to play for Empoli.

On 19 January 2011, a half-year loan transfer to Polonia Warsaw was announced.

[6] Although he had made only a few appearances for his club, he was noticed by Leo Beenhakker and debuted for the Poland national team a short while later, in a friendly away to the United Arab Emirates on 6 December 2006.

He was called up for Euro 2008 and made one appearance, in Poland's final match against Croatia.