But what does an XI of the most expensive transfers of the summer, worth more than 840 million euros combined, look like?
We put one together, and it's a great way to remember some of the biggest moves of the window!
Goalkeeper
Lucas Chevalier (Lille → PSG, €40 million)
Nothing easy awaits Lucas Chevalier between the PSG sticks - his predecessor Gianluigi Donnarumma set the bar very high. However, the now former Lille goalkeeper is in a good position, as his arrival at the Parc des Princes was requested by the coach, Luis Enrique, himself.
And Chevalier has started well. PSG won the UEFA Super Cup with him in the lineup, and the Calais native contributed with a penalty save in a dramatic shootout. Three more competitive games? Two clean sheets and nine points. A respectable record for the most expensive French goalkeeper of all time.
Defenders
Jeremie Frimpong (Leverkusen → Liverpool, €40 million)
Many might prefer to see Jeremie Frimpong on the edge of midfield due to his offensive tendencies, but Frimpong started at right-back at Liverpool. The tireless runner, however, only managed an unsuccessful Community Shield against Crystal Palace and then an hour in the Premier League. Against Bournemouth, he managed to get a shot on target but also injured his hamstring.
He should be available to Arne Slote again after the international break. And at the turn of the year, maybe even on the aforementioned wing, as Mohamed Salah is heading to the Africa Cup of Nations.
Illya Zabarnyi (Bournemouth → PSG, €63 million)
For many years, Illya Zabarnyi was considered one of the most talented stoppers in European football. Now at 23, the Ukrainian international is already the finished article and also the 13th most expensive defender of all time (and the second most expensive Ukrainian).
He's now left the Premier League, in which he's played two full seasons. PSG is counting on him to help out with rotation, as the right central defender position should be occupied more often than not by their experienced captain, Marquinhos.
Dean Huijsen (Bournemouth → Real Madrid, €59.5 million)
Dean Huijsen is a new member of the Los Blancos defensive line. The Amsterdam native, who grew up in Marbella, Spain, and has been rooting for Real since he was young, has always considered Sergio Ramos his idol.
Huijsen has already managed eight competitive games at Real and looks set to be a cornerstone of Xabi Alonso's defence. All that is awaiting him is his first goal, which the handy left-sided player will probably celebrate as the 'Chill Guy' once again.
Alvaro Carreras (Benfica → Real Madrid, €50 million)
Spanish full-back Alvaro Carreras flew into his new engagement at one of the most famous football addresses in the world with a bang. He has played full minutes in the opening three rounds of LaLiga, and with injuries to rivals Ferlando Mendy and Eduardo Camavinga, he is sending a clear signal to coach Xabi Alonso: He's ready.
But that's what is expected from a defender for whom Real Madrid shelled out 50 million euros - the seventh most expensive sale in Benfica's history, by the way.
Midfielders
Florian Wirtz (Leverkusen → Liverpool, €125 million)
Florian Wirtz's was a record-breaking fee. That is, at least until the last day of transfers, when current teammate Alexander Isak deprived him of top spot. Wirtz cost Liverpool an astronomical €125 million, with bonuses that could shoot the amount of his move to Anfield up to €150 million in the future.
The Reds have made the former Leverkusen talisman, who notched 24 goal contributions (10+14) in the last Bundesliga season, the most expensive German footballer of all time. Kai Havertz, for whom Chelsea also shelled out €100 million to Bayer, might be quietly envious.
Martin Zubimendi (Real Sociedad → Arsenal, €70 million)
Arsenal's first representative in the most expensive XI of the last transfer window is not very striking at first glance. Midfielder Martin Zubimendi, loyal to Real Sociedad until the summer, can build on the work of his current coach at the Gunners - after all, like Mikel Arteta, he comes from San Sebastian.
Isak enters his story too - if it wasn't for the Swedish forward's €77.5 million transfer to Newcastle, Zubimendi's departure to North London would have been the most lucrative ever in the Basque club's history.
Eberechi Eze (Crystal Palace → Arsenal, €69.3 million)
And for the second time, the Gunners. In Eberechi Eze's case, it's a very similar amount (only €700k less), but also a fairytale story. The native of Greenwich has, in fact, returned to Arsenal after 14 long years, having worn its colours as a youngster.
Moreover, the most expensive man in Crystal Palace history (the seventh Englishman) makes no secret of the fact that he is a lifelong 'Gooner'. The icing on the cake is the fact that the new signing of the North London club has been given the iconic number 10 on his back.
Forwards
Nick Woltemade (Stuttgart → Newcastle, €85 million)
When the most expensive signing in Newcastle's history was introduced to the fans on the River Tyne, he highlighted his technique. The almost two-metre-tall giant deceives with his body.
He left Bremen for free before the season just gone to then net 12 Bundesliga goals and comfortably broke Stuttgart's sale record - VfB had gained the most on Benjamin Pavard (€35m) before him.
Alexander Isak (Newcastle → Liverpool, €144 million)
And finally, to Alexander Isak. Although his name has been mentioned several times in the text, his place is at the tip of the attack. The Swedish striker is the most expensive player in Premier League history as of Monday evening, as Liverpool shelled out a record €144 million to Newcastle for his services.
The Solna native had a terrific season in which he scored 23 league goals and added six assists. The question is whether he can build on that under the weight of enormous pressure and extreme expectations.
Hugo Ekitike (Frankfurt → Liverpool, €95 million)
The fourth man on Anfield Road in this list. Hugo Ekitike headed to Liverpool from Frankfurt for €95 million, equalling the German club's record sale. His compatriot Randal Kolo Muani, acquired by PSG two years ago, was just as expensive.
The lanky new Reds forward, who scored two goals in the opening three rounds of the Premier League, also became the fifth most expensive Frenchman in history. He trails only Paul Pogba, Antoine Griezmann, Ousmane Dembele and Kylian Mbappe.
Substitutes
If we disregarded positions, the fifth most expensive player of the last transfer period was Benjamin Sesko (Leipzig → Manchester United, €76.5 million), the sixth Victor Osimhen (Napoli → Galatasaray, €75 million), the eighth Matheus Cunha (Wolves → Manchester United, €74.2 million) and the 10th Luis Diaz (Liverpool → Bayern, €70 million) would also get into the lineup.