The midfielder signed first team forms on 28th October 2022 and was named on the bench in the 2-0 Isuzu FA Trophy first round win at Macclesfield.

Oliwier moved to the UK with his family from Poland when he was 15 years old.

The central midfielder played for MUKS CWZS Bydgoszcz academy programme which is highly regarded in his homeland.

Oliwier was used as a second half substitute in the West Riding County Cup against Horbury Town.

On 21st February 2023 Oliwier made his senior debut as a second half substitute in a 0-0 draw with Lancaster City at Nethermoor.

Grzelak made several crucial appearances for the Young Lions in their title winning 2023/24 campaign.

Following the conclusion of the 2023/24 campaign Grzelak left the club and joined Stocksbridge Park Steels.