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#2 Diego Costa | Chelsea to Atletico Madrid (£57 million) | 2017
Diego Costa's transfer had to involve quite a bit of drama, as is always expected with the player. Atletico Madrid's favorite son took a flight to London back in 2014. What was once lauded as one of the biggest arrivals in the EPL turned out to be a below-par one.
After three dragging seasons in England, Costa handed in a transfer request and expressed his desire to join his former side. While Diego Simeone was waiting for his former striker with open arms, the latter had to push himself out of Chelsea, who had placed a hefty amount over him.
Costa was presented back at Wanda Metropolitano in January 2018 after having to face a transfer ban that was imposed on Atletico. Despite being one of Chelsea's worst signings, the Costa move was a hit for the Londoners commercially.
#3 Oscar | Chelsea to Shanghai Port (£60 million) | 2017
Oscar's transfer came as a shocker to everyone in the world of football. The infamous transfer that took place in 2017 saw Oscar, who was at the pinnacle of his career, leave the biggest platform for a smaller league.
Even though Chelsea ended up with swollen pockets after Oscar's departure, the Brazilian was subject to harsh criticism and was called out as someone who chose money over quality.
At the prime age of 25, Oscar became one of the highest-paid footballers on the planet. This is what he said after completing the signing.
China has incredible financial power and sometimes makes offers that players can’t refuse.
Oscar was a regular during the Mourinho era and the former Stamford Bridge player was offered huge fees from some of the big names across Europe's top five leagues.
#1 Eden Hazard | Chelsea to Real Madrid (£89 million) | 2019
It is no surprise that Chelsea earned the most while letting go of their favorite kid. The Belgian, who rose to fame in the blue jersey, completed the impending move to Madrid by breaking the club's record and a lot of hearts.
Despite being one of the finest players in the Premier League, the Belgian captain couldn't carry forward his form in the Spanish capital. Hazard's constant run-in with injuries and fitness issues raised many questions amidst the Madridistas.
However, the team and the coaching staff maintained their trust in the former Chelsea wonderkid. Eden still remains one of the main players within the ranks of Real Madrid.
