#3 Achraf Hakimi (Real Madrid to Inter Milan): €40 million
Real Madrid academy product Achraf Hakimi has moved to Italian club Inter Milan after featuring in only nine games across three years at the Spanish capital club.
The 21-year-old Hakimi, a full-back who can also operate as a right-back or a winger, had impressed in a two-year loan spell at Borussia Dortmund where he scored seven goals in 54 appearances in all competitions.
With clubs like Manchester City and Chelsea also interested in the services of the Moroccan player, it was Inter Milan who had their bid of €40 million for the player accepted by Real Madrid.
#2 Timo Werner (Leipzig to Chelsea) €53 million
After a career-best season with Leipzig, in which he scored 34 goals in all competitions, Timo Werner was swopped up by Chelsea despite long-standing interest from Liverpool.
The Premier League champions had courted the 24-year-old striker for a long time, but their interest in the player cooled owing to their finances being hit by the COVID-19 pandemic.
Chelsea pounded at the opportunity and acquired the services of Timo Werner in a deal worth £47 million (€53 million), offering the player a 5-year contract.
Nicknamed 'Turbo Werner' for his explosive pace and acceleration, the former Stuttgart man started off as a winger before transitioning to a centre-forward at Leipzig.
In Werner, Chelsea have a proven goal-scorer in their ran, but it remains to be seen how quickly the young striker is able to adapt to the physicality of the Premier League.
#1 Victor Osimhen (Lille to Napoli) €70 million
Victor Osimhen has been the most expensive signing of the 2020-21 summer transfer window, as on 4th September 2020.
The 21-year-old Nigerian striker impressed in the 2019/20 season at Lille, where he scored 18 goals in all competitions.
With Premier League clubs Manchester United and Liverpool also seeking Osimhen, it was Napoli who acquired his services by splashing out €70 million to Lille who had spent only €12 million to bring in the player from Charleroi a season before.