Mário Sauer joins on loan from French club FC Toulouse, where he moved last summer.
He immediately established himself in the Toulouse squad, featuring in a total of 29 matches last season.
Sauer reached a significant milestone last year at the U21 Championship, where he was a key player for the team, appearing in all three group stage matches. His performances earned him a call-up to Slovakia's senior national team, making his debut in March 2026 and currently boasting three caps for his country.
"With Mário, we're acquiring another young and talented player whose flexible profile aligns perfectly with our current transfer strategy. As a classic box-to-box midfielder, he complements our midfield, while his depth of play and finishing abilities create more offensive options for us.
Furthermore, his exceptional stamina makes him an ideal fit for our intense playing style," stated FCK Sporting Director Marcel Klos, clearly pleased with the new acquisition.