Sergio Ramos, the former Real Madrid stalwart considered one of the best defenders in the world, has signed a two-year contract with Paris Saint-Germain, the French club said Thursday, reports AFP. Ramos, 35, won the Champions League four times with Real and is a World Cup winner and a two-time champion of Europe with Spain. The veteran, who has won 180 caps and scored 23 goals for his country, arrives with PSG desperate to add experience to their squad for another assault on an elusive first Champions League title. "It's a big change in my life, a new challenge and a day I shall never forget," Ramos said in a PSG statement. Ramos, who cut his teeth with Sevilla before joining Real in 2005, played almost 500 games for Los Blancos, marshalling their defence for 16 seasons and winning La Liga five times.