8. Kleberson
Kleberson was the captain of the Brazilian national team when he signed on at Old Trafford, having just helped his country to yet another world title in Japan and Korea.
However, his international form could’t translate domestically and after being earmarked as the eventual replacement for Juan Sebastian Veron he made just 20 appearances over the course of two seasons and was sold on to Besiktas for just under half of what they bought him for.