8) Mendieta to Middlesborough
Mendieta was a great player that made his name playing for Spanish club Valencia. He was signed by Lazio in 2001 for £29million. Sadly, he struggled to continue the form he had shown at Valencia, and went out on loan for a season at Barcelona. He wanted to leave Lazio permanently was Steve McClaren convinced him to join Middlesborough, where he made just 83 appearances in 4 years before retiring.