Excelsior signs Kasey Bos from FSV Mainz for one season. The left-back did not play for Mainz last season due to injury. Kasey played in the youth academy of Melbourne City in Australia and moved to Melbourne Victory in 2021, where he made his professional debut. Since then, both brothers, who play as left-backs, have followed their own paths. Kasey moved to Europe last year to play for Mainz. Now, Kasey, who is half a year younger than his brother Jordan, will play in the same city as his brother again. Excelsior maintained its position in the Eredivisie last season, which means the brothers may face each other in the coming season. Jordan is now three years international for the Socceroos, with whom he will attend the World Cup as a taste-maker. Kasey did not play for Mainz last season due to injury and is now moving to Rotterdam. Meanwhile, Jordan moved via KVC Westerlo to Feyenoord, where he had a successful debut season.