Union Saint-Gilloise have agreed on a deal to sign striker Mateo Biondic in a move from the 4th division in Germany to Champions League football. Transfer reporter Fabrizio Romano confirmed the news on January 2, 2026. The Belgian club reached terms with German side Eintracht Trier. A medical check comes next soon.
Biondic is 22 years old. He was born in Lemgo, Germany, and has Croatian roots through family. At 1.90 metres tall, he plays as a centre-forward.
This season in the Regionalliga Südwest, one of Germany’s fourth-tier leagues, he scored seven goals and set up five more in 17 games. That caught attention from higher levels.
Eintracht Trier sit mid-table in their division. They signed Biondic on a free transfer last summer from SC Verl, a third-division club. He had spent time on loan there before. His youth career included stints at Hannover 96, Schalke 04, and Paderborn.
Union Saint-Gilloise, often called Union SG, lead the Belgian Pro League. They compete in the Champions League league phase this season. The club has a track record of finding gems from lower leagues.
Deniz Undav stands out as an example. He joined from Germany’s third tier in 2020, scored heavily, and later moved to the Premier League and earned Germany caps.
This move feels like a big leap for Biondic. From semi-professional football to facing top European sides. Clubs like Holstein Kiel and Paderborn watched him too, but Union moved fastest.
The fee isn’t public yet. Reports suggest it’s in the low hundreds of thousands of euros. His market value sat around €100,000 before the news.
Biondic’s contract with Trier ran until 2027. The deal lets him leave now in January. He could join training right away and play soon.
Fans of Union SG like these kinds of signings. The club builds smartly, mixing young talent with experience. They aim to stay competitive in Belgium and Europe.
For Eintracht Trier, losing a top scorer hurts mid-season. But the money helps a smaller club.
Biondic has kept quiet on social media so far. No big statements from him or the clubs yet.
This story shows football’s surprises. A strong half-season can change everything. Young players dream of steps like this.
Union play in the Champions League again soon. Adding depth up front makes sense.
The transfer should wrap up after the medical. Then Biondic starts a new chapter in Brussels. Stories of quick rises keep the game exciting. Everyone watches how he settles in.
