Over £3.4bn have been spent in England, Spain, Germany, Italy and France. A big chunk of that pertains to Neymar's record-breaking transfer to Paris Saint-Germain for £198 million, but the Brazilian has not been the only one at the heart of a big-money transfer.
Dembele to Barcelona, Lukaku to Manchester United, Morata to Chelsea or AC Milan's summer spending spree have been the headlines. However, the Guardian had a look at the more modest deals which went under the radar and have the potential to eventually prove more cost-effective. Only time will tell...
Here are the 16 great signing that have taken place in the midst of the inflation of the transfer window:
Leonardo Bonucci, from Juventus to Milan for £35.2m
Youri Tielemans, Anderlecht to Monaco for £21.6m
Dani Ceballos, Real Betis to Real Madrid for £14.5m
Cengiz Under, Basaksehir to Roma for £11.7m
Terence Kongolo, Feyenoord to Monaco for £11.4m
Marco Benassi, Torino to Fiorentina for £9m
Bertrand Traoré, Chelsea to Lyon for £8.8m
Andy Robertson, Hull City to Liverpool for £8m
Valère Germain, Monaco to Marseille for £7m
Ryad Boudebouz, Montpellier to Real Betis for £6.3m
Kyriakos Papadopoulos, Bayer Leverkusen to Hamburg for £5.8m
Sandro Ramírez, Málaga to Everton for £5.3m
Sead Kolasinac, Schalke to Arsenal on a free
Dani Alves, Juventus to Paris Saint-Germain on a free
Sebastian Rudy, Hoffenheim to Bayern on a free
Dan-Axel Zagadou, Paris Saint-Germain to Borussia Dortmund for a tribunal fee