After a short stay at Göztepe, he made a highly controversial move to Brøndby's archrivals FC Copenhagen in August 2020, signing a three-year contract.

He also played for UD Horadada and Elche CF Ilicitano for short periods before moving on to GKS Jastrzębie in the Polish second tier from September 2007 to December 2008.

[13] He continued his goalscoring form throughout the fall, becoming one of the most scoring players in Europe in 2018, only surpassed by the likes of Cristiano Ronaldo and Lionel Messi.

[21] On 22 January 2020, Turkish Süper Lig club Göztepe SK confirmed the signing of Wilczek on a one-and-a-half-year contract.

[27][28] Wilczek had at that point already been labelled "Judas" by some Brøndby supporters, with angry fans of the team recording videos of themselves burning his jersey.

[29][30] On the evening after the move was announced, a large group of fans protested in front of Brøndby Stadium to show their discontent with Wilczek's transfer.

[32] He made his first European appearance for Copenhagen on 17 September in a 2–1 win over IFK Göteborg at Ullevi in the second qualifying round of the Europa League.

[34] On 31 January 2022, Wilczek terminated his contract with Copenhagen and joined Piast Gliwice on a two-and-a-half-year deal, making it the third time in his career he signed with the Silesian side.

[35] On 17 May 2024, after his role within the roster was reduced due to injuries, Piast announced Wilczek would depart the club at the end of the season.

He got his debut call-up in the Poland national team for the UEFA Euro 2016 qualifiers against Scotland and Republic of Ireland in October 2015.