Almost €3 billion ($3.54bn) was spent during the 2020/21 summer transfer window.
There were several deadline day deals that caught the eye, not least at Manchester United.
Edinson Cavani joined as a free agent after leaving Paris Saint-Germain in the summer.
Alex Telles, Facundo Pellistri and Amad Diallo Traore joined from Porto, Penarol and Atalanta respectively while Chris Smalling moved to Roma after a successful season on loan at the Italian club.
Arsenal secured the services of midfielder Thomas Partey from Atletico Madrid after meeting the Ghanian's €45 million release clause.
In turn, Alex Torreira moved to Atletico on a season-long loan while another midfielder, Mattéo Guendouzi, agreed a similar deal to join Hertha Berlin.
Mesut Ozil, the club's highest earner, remains at the club.
Juventus pair Diego Costa and Mattia De Sciglio will spend the season on loan at Bayern Munich and Lyon respectively, while the Italian champions reinforced their forward line by taking Italy striker Federico Chiesa on loan from Fiorentina.
