50 most expensive transfers of summer window, ranked by true cost: Isak isn't No. 1

The article discusses the 50 most expensive transfers of the 2025 summer transfer window, ranked by their true cost rather than the reported fee. The true cost takes into account factors like signing bonuses, agent fees, and the player's salary over the life of the contract. The article notes that the reported fee may not always reflect the full financial impact on the club, as additional costs can significantly increase the overall expense. The rankings are based on this comprehensive analysis, which provides a more accurate representation of the transfer's true financial burden. The article does not reveal the number one most expensive transfer, but it suggests that the signing of Swedish striker Alexander Isak is not the top transfer on the list. The focus is on providing a nuanced perspective on transfer fees and the hidden costs associated with player acquisitions in the modern football landscape.