He made his Latics debut on 26 August 2008 in a League Cup match against Notts County and scored the final goal in a 4–0 win.

In the 2009–10 season, he finished as the third highest goalscorer in the reserve league, with six goals in thirteen matches, playing primarily on the wing.

[6] On 2 June 2010, the Polish side Jagiellonia Białystok signed Kupisz, who was a free agent after the end of his contract with Wigan.

[7] On 29 July, he made his official debut for Jagiellonia in a Europa League qualifying match against Aris Thessaloniki F.C., his side losing 1–2.

[15] On 2 September 2022, shortly after terminating his contract with Pordenone, he left Italy and returned to Jagiellonia on a two-year deal, with an extension option.