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Former Chelsea full-back Paulo Ferreira has said Cristiano Ronaldo can "definitely" play until he is 40.
Ferreira played alongside Ronaldo for Portugal before hanging up his international boots in 2010. He subsequently retired from playing completely in 2013 and has watched on as Ronaldo has added numerous titles to his already packed trophy cabinet at Real Madrid and Juventus.
Ferreira does not see any prospect of Ronaldo slowing down soon if he stays fit, per Nizaar Kinsella of Goal:
"I've known Cristiano for a long time.