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Top 10 most expensive Jose Mourinho transfer signings

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9. Diego Costa (€38 million)

MANCHESTER, ENGLAND – DECEMBER 03: Diego Costa of Chelsea celebrates scoring his team’s first goal during the Premier League match between Manchester City and Chelsea at Etihad Stadium on December 3, 2016 in Manchester, England. (Photo by Clive Brunskill/Getty Images)

Deigo Costa joined Chelsea in 2014 and made an immediate impact netting 20 goals in his debut season to help Mourinho win his third Premier League crown.

Costa won the league once again, in 2017 with Antonio Conte before returning back to Atletico Madrid in January 2018.