The major European clubs concluded many strong deals during the current summer transfer period, as major leagues will end their transfer campaigns by next September. Declan Rice’s €116.6 million move from West Ham United to Arsenal is the most expensive transfer of the 2023 summer window so far, but Moises Caicedo's move to Chelsea could end up blowing that out of the water. Moises Caicedo became second on the list of the most expensive in the summer Mercato after he moved from Brighton to Chelsea for 116 million euros.

1- Declan Rice - moved from West Ham to Arsenal - 116.6 million euros.
2- Moises Caicedo - moved from Brighton to Chelsea - 116 million euros.
3- Jude Bellingham - moved from Borussia Dortmund to Real Madrid - 103 million euros.
4- Harry Kane - moved from Tottenham to Bayern Munich - 100 million euros.
5- Josko Guardiol - moved from Leipzig to Manchester City - 90 million euros.
6- Rasmus Holland – moved from Atalanta to Manchester United – 75 million euros.
7- Kai Havertz - moved from Chelsea to Arsenal - 70 million euros.
8- Dominic Suboslay - moved from Leipzig to Liverpool - 70 million euros.
9- Mason Mount - moved from Chelsea to Manchester United - 64.20 million euros.
10- Sandro Tonali - moved from Milan to Newcastle United - 64 million euros.