Ślusarski joined Dyskobolia Grodzisk Wielkopolski in early 2004 as a replacement for Grzegorz Rasiak who had refused to sign a new contract.

[1] He spent the 2006–07 season on loan at UD Leiria in the Portuguese top flight, helping them qualify for the Intertoto Cup and winning their Player of the Year award.

[2] On 24 August 2007, he signed a two-year deal with West Bromwich Albion; the Baggies paid Dyskobolia £680,000 for Ślusarski's services.

[9] He scored his first goal for Sheffield Wednesday on 26 April 2008 in his second start for the club, contributing to a crucial win in their battle against relegation.

[10] On 27 November 2008, Ślusarski re-joined Sheffield Wednesday on loan in an initial one-month deal, with a view to a permanent transfer in January.