Inter Milan's players celebrate with the

5 Clubs That Conducted the Best Business In a Transfer Window Since the Turn of the Millennium

The summer transfer window is in full swing, with a number of top clubs already signing players in order to strengthen their squads for the season ahead. Real Madrid have been most active so far, spending almost €300million spent on the likes of Chelsea superstar Eden Hazard, promising Eintracht Frankfurt forward Luka Jovic and Lyon left-back Ferland Mendy.

Here, we take a look at five clubs who have conducted the best business in a transfer window since the turn of the Millennium.

5. AS Roma - 2000

AS Roma splashed the money in 2000 to sign the likes of Gabriel Batistuta, Emerson, Walter Samuel and Jonathan Zebina, spending a total of almost €100million in the summer transfer window.

The move definitely worked as their then most expensive player, Batistuta fired them to the Serie A title, scoring 20 goals in 28 games, while Emerson and Samuel put in impressive performances.

Money truly well spent.

AS Roma Top 2000 Transfers

Gabriel Batistuta: €36.15m

Emerson: €18m

Walter Samuel: €20.8m

Jonathan Zebina: €18.4m 

4. Barcelona - 2003

Barcelona were in dire straits at the end of the 2002 season, with their rivals Real Madrid dominating both domestically and in Europe. However, 2003 can be called as the second coming of the Catalan club as they managed to sign Ronaldinho from Paris Saint-Germain, a player who changed the history of the club.

The club also lured the likes of Edgar Davids (loan), Rafael Marquez and Gio van Bronckhurst - players who played a major role in their resurgence.

Barcelona Top 2003 Transfers

Ronaldinho: €32.25m

Rafael Marquez: €6.35m

Edgar Davids: €2m (Loan)

Gio van Bronckhurst: Loan

3. Chelsea - 2004

Roman Abramovich's purchase of Chelsea, changed the fortunes of the club with the Russian pumping in the millions to make the Blues one of the most successful clubs in Premier League history.

The summer of 2004 saw the arrival of Didier Drogba, Ricardo Carvalho, Arjen Robben, Petr Cech, Paulo Ferreira - stars who changed the fortunes of the club while he made another masterstroke in luring the "Special One" Jose Mourinho to Stamford Bridge.

Chelsea Top 2004 Transfers

Didier Drogba: €38.5m

Ricardo Carvalho: €30m

Paulo Ferreira: €20m

Arjen Robben: €18m

Petr Cech: €13m

Tiago: €15m 

2. Real Madrid - 2009

Following a period of poor campaigns both domestically and in Europe, Florentino Perez' re-election as Real Madrid president in 2009 saw the Spaniard splurge the money as he brought about the second wave of the "Galacticos".

The Los Blancos broke the then world record transfer fee to sign Cristiano Ronaldo from Manchester, while also luring the likes of Kaka, Xabi Alonso, Karim Benzema and Raul Albiol. While the moves did not work immediately, Ronaldo, Alonso and Benzema played a key part in their future successes'.

Real Madrid Top 2009 Transfers

Cristiano Ronaldo: €94m

Kaka: €67m

Karim Benzema: €35m

Xabi Alonso: €34.5m

Raul Albiol: €15m

1. Inter Milan - 2009

Arguably the best transfer window a team has experienced came in 2009, when Inter Milan signed Diego Milito, Samuel Eto’o, Wesley Sneijder, Thiago Motta and Lucio and these players played a major role in the club winning the treble that season.

Milito and Eto'o scored a combined 46 goals in all competitions while Sneijder had the best season his career, leading the club in midfield. Motta was impressive in the defensive midfield position while Lucio added steel to the back-line.

Inter Milan Top 2009 Transfers

Diego Milito: €25m

Samuel Eto'o: €20m

Wesley Sneijder: €15m

Thiago Motta: €10.2m

Lucio: €7m