6. Christian Vieri - £32m | Lazio to Inter Milan in 1999

The Zlatan Ibrahimovich of yesteryear, Vieri was renowned for switching clubs for mega-money.

Inter joined the long list of suitors, spending a record £32 million to bring the Italian to the San Siro.

Money well spent? Well, Inter only lifted the Italian Cup in 2005, and they struggled to challenge for the Serie A title during Vieri's spell with the club.

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