Zagłębie Lubin announced that Marek Mróz has departed. Mróz has joined Polonia Warszawa on a free transfer following the termination of his contract with Zagłębie Lubin by mutual agreement. He signed a contract with Polonia Warszawa that is valid until June 30, 2027, and includes an option for a 12-month extension. Marek Mróz expressed happiness about joining Polonia Warszawa. He stated that his primary position is in midfield as a number eight or ten, and added that discussions with the coach confirmed he is seen in that role. Mróz also said that the club clearly presented its goals and that he does not consider moving to a lower league to be a step back for his development. Polonia Warszawa confirmed that this is the club's first winter transfer.

Polonia Warszawa is very determined to acquire Marek Mróz from Zagłębie Lubin, as reported by Kamil Bętkowski on the LIGOWIEC channel. Despite previous interest in June, the club continues its efforts to sign the midfielder, who has 54 appearances, three goals, and three assists in the Ekstraklasa. Mróz's contract expires next year, providing Zagłębie a potential last chance to monetize his departure.

Zagłębie Lubin's Marek Mróz is under consideration for a transfer to Polonia Warszawa, according to reports by Kamil Bętkowski on the LIGOWIEC channel. Mróz, who joined Zagłębie Lubin in 2023 on a free transfer, is contracted with the club until June 30, 2026. Polonia Warszawa is reportedly keen on acquiring Mróz to enhance their squad as they aim for promotion to the Ekstraklasa. The 26-year-old offensive midfielder began his tenure at Zagłębie Lubin as a reserve player but gradually became a more consistent starter towards the end of his first season. Nonetheless, his prominence in the team waned in the latter part of the most recent season, despite having been a key player earlier. Polonia Warszawa, who finished sixth in the league and secured a place in the promotion playoffs, were ultimately knocked out in the semifinals by Wisła Płock. The club is looking to strengthen their ranks with Mróz to renew their promotion challenge in the upcoming season.