He has previously played for BK Häcken and FC Väsby United and GIF Sundsvall.

In August 2013 Holster signed for Azerbaijan Premier League side Ravan Baku.

[1] On 19 October 2013, Holster made his debut for Ravan Baku, coming on as a half time substitute for Miloš Adamović in their 2-1 defeat to Neftchi Baku.

[2] Holster left Ravan at the start of the winter break in December 2013,[3] and went on to sign a two-year contract with Assyriska in March 2014.

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