In January 2001, Spanish La Liga side Valencia signed Aimar from River for a club-record fee of €24 million (£13 million). He made his debut for the club the following month against Manchester United and drew praise from three-time Ballon d'Or winner Johan Cruyff for his performance after the match. The following weekend he scored on his La Liga debut, netting in a 2–0 away win over Las Palmas. Aimar immediately became a key figure in Valencia's midfield under Héctor Cúper and helped the club reach the 2001 UEFA Champions League final, where they lost to Bayern Munich on penalties.