The 2026 summer transfer window, spanning the World Cup in the US, closed with several notable patterns across Europe's top leagues. The tournament acted as a shop window for breakout talents, while some elite clubs moved early for targets even as their players competed, and promoted Premier League clubs spent unprecedented sums compared with the frugality of past newly-promoted sides.

Yan Diomande's World Cup form for Côte d'Ivoire helped drive a £115.7m move to Real Madrid, who also signed Marc Cucurella (£52m) and Bernardo Silva just before Spain's and Portugal's openers. Tottenham spent almost £230m before the last 16, while newly-promoted Hull, Ipswich and Coventry splashed a combined £473.6m on 44 players, dwarfing the £98.8m spent by 2021's promoted trio. Ligue 1 clubs, led by PSG's £150m-plus net profit from selling Bradley Barcola to Liverpool, largely profited from trading, while Fiorentina underwent a major squad overhaul after a poor Serie A campaign.