Having been bought by the Premier League club Chelsea in 2004, he was loaned to Dutch team PSV and he won 3 Eredivisie titles with them. Alex finally joined the Chelsea squad in the summer of 2007 after three years in the Netherlands. In his time at Chelsea, he won the FA Cup in 2009 and a league and FA Cup "double" in 2010, as well as reaching the 2008 UEFA Champions League Final. He joined Paris Saint-Germain for £4.2 million in January 2012 and won Ligue 1 twice with the club, moving to Milan on the expiration of his contract in 2014 and retiring two years later.