6. Javier Mascherano (January 2007)
A title-winner in Argentina and Brazil, Javier Mascherano made his debut in English football with West Ham United in 2006 before Rafael Benitez moved to sign him for the Reds - initially on loan - in January of the following year.
It was an astute capture. Mascherano went on to establish himself as one of the world's best defensive midfielders during three-and-a-half years at Anfield and was named Argentina captain by Diego Maradona during his time on Merseyside.
His dynamic style made him a firm favourite with the Kop and he left for Barcelona in the summer of 2010.