Money makes the football world go around, but spending big doesn't always guarantee success.
Sometimes quality players prove incapable of living up to their lofty transfer fees.
GOAL.com came up with their own top-15 most expensive flops in football history.
1.Philippe Coutinho (Liverpool - Barcelona) - €120m
2. Eden Hazard (Chelsea - Real Madrid) - €100m
3. Harry Maguire (Leicester - Man United) - €87m
4. Paul Pogba (Juventus - Man United) - €105m
5. Romelu Lukaku (Inter - Chelsea) - €113m
6. Joao Felix ( Benfica - Atletico) - €126m
7. Nicolas Pepe (Lille - Arsenal) - €80
8. Antoine Griezmann (Atletico - Barcelona) - €120m
9. Alvaro Morata (Real Madrid - Chelsea) - €65m
10. Romelu Lukaku (Everton - Man United) - €85m
11. Ousmane Dembele (Dortmund - Barcelona) - €105m
12. Kepa Arrizabalaga (Bilbao - Chelsea) - €80m
13. Neymar Jr (Barcelona - PSG) - €222m
14. Zlatan Ibrahimovic (Inter - Barcelona) - €70m
15. James Rodriguez (Monaco - Real Madrid) - €80
Who is the biggest flop in Barca's history, in your opinion?