Koeman made a huge blunder with the capture of this "exciting" winger.
The Whites brought the defender in for nothing and he has been a big upgrade on Junior Firpo.
The former Saints central midfielder flopped throughout his time at St. Mary's.
The former Gers boss hit the jackpot with his swoop for the exciting attacker in 2021.
Nottingham Forest hit the jackpot with the signing of this 5 foot 10 marksman.
The centre-forward struggled during his only season with the Hammers before leaving this summer.
The Elland Road outfit simply struck gold with the signing of one 5 foot 9 sensation in the recent past.
The Villains ended up selling him for a club record fee...
The Scottish giants ended up selling him for a club-record transfer fee after his impressive performances for the side.
The Gers broke their record sale with a former academy graduate under Walter Smith
The Elland Road outfit made a particularly big profit on one former star...
Wolves have seen some star players arrive at Molineux over the years, with not many providing as many golden moments as one man...
He ended up leaving St. Mary's on a free transfer after a disappointing spell in England.
The Tottenham chairman saw one notable signing leave the club on a free transfer in the recent past.
One of Mourinho's signings saw his value drop by £29m during his spell at United.
One of Caixinha's signings struggled majorly at Ibrox and scored just five times in 14 games.
The former Villans boss provided the young talent with a platform to shine at Villa Park.
The central midfielder enjoyed a terrific time with the Light Blues after joining for £50k.
The "disappointing" club-record signing was a huge flop for the former Saints boss.
The former manager made a few signings in the summer of 2017, yet one stands out as being a big blunder.