10. Joos Valgaeren
Joos Valgaeren is the first name on the list at number ten, with the former Celtic centre-back signing for the club for a fee of £5.13million.
Valgaeren made over 50 appearances in total for the Bhoys, before departing in 2005, as he moved to Belgian side Club Brugge. He called time on his playing career in 2009 after a spell with Dutch side FC Emmen.