The summer transfer window was officially brought into effect by UEFA ahead of the 2002/03 season and has become one of the most discussed areas of football.
Little did the governing bodies know back then that restricting new signings to a specific time period would inadvertently spawn a whole new world of yellow ties, ITKs, sex toys in ears and Peter Odemwingie in car parks.
While nothing is as anticipated in modern football as a new signing, things don't always go to plan. Case in point: Liverpool used the first official window to bring in El-Hadji Diouf, Salif Diao and Bruno Cheyrou. Yikes. However, the Reds have had plenty of good windows too.
Here are Liverpool's best summer windows ranked:
8. 2020/21© ProShots - Thiago Alcantara
Ins: Diogo Jota (£45m, Wolves), Thiago Alcantara (£20m, Bayern Munich), Kostas Tsimikas (£11.7m)
Outs: Dejan Lovren (£11m, Zenit), Adam Lallana (Free), Nathaniel Clyne (Free)
The Reds may not have spent big amid the Covid hit, but all three of the first-team signings made in the summer after their first title in 30 years have gone on to become successes in one way or another.
The reason this doesn't rank higher is due to the lack of recruitment at centre back following the departure of Lovren, which would go on to cause major issues that season following serious injuries to just about everyone wearing a Liverpool shirt.
7. 2007/08Ins: Fernando Torres (£20m, Atletico Madrid), Ryan Babel (£11.5m, Ajax), Lucas Leiva (£6m, Gremio), Yossi Benayoun (£5m, West Ham), Sebastian Leto (£1.8m, Lanus), Krisztian Nemeth (£1m, MTK Budapest), Charles Itandje (Undisclosed, Lens), Damien Plessis (Undisclosed, Lyon), Andriy Voronin (Free)
Outs: Craig Bellamy (£7.5m, West Ham), Mohamed Sissoko (£7m, Juventus), Djibril
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