Rio Ferdinand has revealed what Cristiano Ronaldo told him when he asked the question on everyone's lips: "What is the secret to your success?"

The former Manchester United centre-back hailed the Real Madrid forward ahead of his side's Champions League clash with Atletico.

He explained that Ronaldo's experience has only helped him improve his game, and suggested the ex Red Devils star has proved many doubters wrong.

This season the 32-year-old became the first player in history to score 100 Champions League goals when he netted against Bayern Munich.

"When he [Ronaldo] got to 30 [years old] people questioned if he could continue," Ferdinand said on BT Sports.

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