How would you spend one-billion euros? If you're struggling for ideas, just ask the owners of top European sides, more and more of whom are spending huge fees for the world's best players.
Four teams on the list are from the Premier League, but there are a few surprising omissions, such as Champions League holders Real Madrid.
This data is provided by research done by the CIES Football Observatory.
#7 Juventus: €1bn
Juventus are the only Italian club to have reached €1bn on transfers, a statistic which has seen them dominate Serie A and reach the Champions League final in 2017. Cristiano Ronaldo and Gonzalo Higuan are two players that Juve have bought in recent years.
#6 Liverpool: €1.07bn
The funds trusted to Jugen Klopp this summer have seen Liverpool pass the €1bn mark, with Naby Keita, Xherdan Shaqiri and Fabinho beefing up the Reds' midfield. Brazilian Alisson also joined for a world record fee for a goalkeeper. The pressure is on Klopp this year to win trophies to justify this huge spending spree.
#5 Manchester United: €1.10bn
Since the great Sir Alex Ferguson left, United have switched focus from developing academy players to spending big in the transfer market. Jose Mourinho has signed a host of stars in the past year, with Alexis Sanchez, Romelu Lukaku and Fred to name a few. Similar to Liverpool, the pressure is on for United to win trophies to merit the huge investments.
#4 Paris Saint-Germain: €1.24bn
PSG's recent signing's of Neymar (€222m) and Kylian Mbappe (€180m) are the two most expensive transfers of all time, and have sent shock-waves throughout the world's transfer markets. More silly money transfers can be expected from the French champions in the coming years as they seek the Champions League title.
#3 Barcelona: €1.26bn
Another club famous for promoting talent from within the academy, Barca have caved under the pressures of modern football in recent years, making some huge moves in the transfer window. Philippe Coutinho and Ousmane Dembele alone have cost the club €300m.
#2 Chelsea: €1.31bn
Chelsea have made a name for themselves in the transfer market since owner Roman Abramovich bought the club, spending big year after year. As a result they have gained themselves somewhat of a pantomime villain reputation in England, despised by purist fans and often referred to as the "plastic" club.
#1 Manchester City: €1.47bn
No club has spent more since 2010 than Man City. A large percentage of transfers has been spent by Pep Guardiola over the last two years of his reign at City, and the funds helped them to a record points tally in the Premier League last season where they became runaway champions. However, the space for the Champions League in the trophy cabinet at City is still empty, much to the amusement of their big league rivals.