The CIES Football Observatory analyzed the summer transfer window 2018/19 in order to determine the least profitable purchase.

The purchase of Chelsea goalkeeper Kepa Arisabalagi from Athletic has become the worst investment of the summer, according to the Football Observatory CIES.

"Blue" signed a 23-year-old Spaniard for 80 million euros, which is 44.7 million euros more than its "fair" value, which was calculated using the algorithms CIES.

The top three least profitable investments of the summer also included transfers from Riyadh Marese from Leicester to Manchester City and Tilo Kerer from Schalke in Paris Saint-Germain.

TOP-10 of the least profitable summer purchases 2018 Player From -> Where A B C Kep Arrisabalaga Athletic -> Chelsea 80. 0 35. 3 +44. 7 Riyadh Mares Leicester -> Manchester City 85. 0 57. 0 +28. 0 Tilo Kerer Schalke -> PSG 37. 0 17. 1 + 19. 9 Yerry Mina Barcelona -> Everton 31. 8 13. 0 +18. 8 Alex Meret Udinese -> Napoli 25. 0 7. 1 + 17. 9 Joao Canselo Valencia -> Juventus 40. 4 22. 7 +17. 7 Javier Pastore PSG -> Roma 24. 7 7. 6 +17.

1 Abdu Diallo Mainz -> Borussia D 30. 0 13. 1 + 16. 9 Jefferson Lerma Levante -> Bournemouth 30. 5 14. 9 +15. 6 Danny Ings Liverpool -> Southampton 22. 2 7. 4 +14. 8 A - Transfer amount, B - "Fair" price, C - Difference (millions of euros) We also offer you to get acquainted with the TOP-10 most profitable transfers of the summer 2018.

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