McTominay has made a significant impact at Napoli, scoring crucial goals and helping his side win the Serie A title. He has also been named Serie A's Most Valuable Player, and his love for Italy's tomatoes has been well-documented.

Another notable transfer is Rivaldo's move from Deportivo La Coruna to Barcelona in 1997 for a fee of €23.5 million. Rivaldo went on to lead Barcelona to the Spanish domestic double in his first season and won the Ballon d'Or a year later.

Alessandro Nesta's move from Lazio to AC Milan in 2002 for €31 million was also a significant one. Nesta had already won the Scudetto with Lazio, but he went on to win several titles with AC Milan, including the Champions League and Serie A.

Wayne Rooney's move from Everton to Manchester United in 2004 for €37 million was a transfer that generated a lot of hype. Rooney went on to have a successful 13-year spell with the Red Devils, winning numerous titles and breaking several records.

Claude Makelele's move from Real Madrid to Chelsea in 2003 for €20 million was also a significant one. Makelele became a pivotal part of Chelsea's team, helping them win their first Premier League title in the 2004/05 season.

These transfers have gone down in history as some of the greatest summer transfer deals in European football. They have changed the course of their respective seasons and have left a lasting impact on their clubs.