Ondřej Kričfaluši is leaving Baník Ostrava for the Belgian club Royal Union Saint-Gilloise, which will pay a release clause of approximately five million euros. According to Baník Ostrava's head of sports Luděk Mikloško, negotiations were strictly defined by the release clause in Kričfaluši's contract, and the Belgian club decided to activate it by agreeing to the fixed buyout price and reaching an agreement with the player. Viktor Kolář, head of the football section at Sport Invest, stated that Royal Union Saint-Gilloise fulfilled their vision for Ondřej Kričfaluši's football future. Kolář added that the club was very interested in him and presented him with their vision and his role in the club's further development. Kričfaluši expressed his excitement about signing with Union and explained that a key reason for accepting the offer immediately was that he liked the club's concept, vision, and approach to player development.

According to Voetbalnieuws.be, Union has confirmed the arrival of Ondrej Kricfalusi. The 22-year-old Czech international from Jong Tsjechië has joined from Banik Ostrava, signing a contract until 2030. The transfer fee is reportedly 5 million euro. Union announced that Kricfalusi is a defensive midfielder.

Union SG is making a strong effort to sign Ondrej Kricfalusi, a 22-year-old Czech central defender from Banik Ostrava. The Brussels-based club is set to pay a €5 million fee, which was the buyout clause stipulated in his contract. In pursuing the defender, Union SG reportedly surpassed the interest of Italian top-flight club Monza. While there is not yet an agreement between the cup winner and the player, it is expected that one will be reached. Kricfalusi, who joined Banik Ostrava in September 2025, has a contract that runs until June 2029. In the 2025/2026 season, he scored 5 goals in 24 Chance Liga appearances and has 17 caps for the Czechia U21 team. Transfermarkt estimates his current market value to be €3.50m.