Arthur Vermeeren, a 21-year-old Belgian defensive midfielder, is being considered as an option for Ajax. He did not manage to meet expectations at Atlético Madrid, RB Leipzig, or during a loan spell at Olympique Marseille. Vermeeren's contract with RB Leipzig is valid until June 2029, and reports from April 2026 suggested the club was seeking a transfer fee between €30 million and €35 million.