A Lithuanian youth international, Mazionis spent time as a schoolboy with the West Ham and Arsenal academies, before moving on to join Kinetic Foundation.
He also spent time with Thurlow Nunn League First Division South side Enfield Borough, breaking into the first team at just 16 years old, before going on trial with Ipswich in March 2023.
In the summer of 2022, Mazionis represented Lithuania’s U17s at the Baltic Cup in Finland having previously won caps at U16 level.
Mazionis was successful in signing a professional deal with Ipswich in May 2023, before breaking into their under-21 side at the end of last season. He is now captain and joins the Cards on his first loan move looking to gain experience at senior level.