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Ronaldo is still playing at the highest level and scoring goals for Portugal and Juventus as he approaches his 36th birthday in February.
He's kept himself in sublime physical condition thanks to a dedicated training regime and Clegg believes there's no reason why he can't surpass former colleague Ryan Giggs, who retired at the age of 40 after playing a ridiculous 23 seasons of professional football.
"Before Ronaldo, the best athlete in terms of work on his body was Ryan Giggs," Clegg told Gazzetta dello Sport.
"He was the strongest, the most attentive to details. If Giggs played at United until he was 40, Ronaldo can play till he is 41.
"Cristiano was the only one able to go beyond the high standards of Giggs."
Ronaldo scored a superb trademark header against Andorra for his 102nd international goal and is now just eight ahead from beating Ali Daei's record.
Cristiano Ronaldo scoring his 102nd international goal with Portugal. :flag_pt:- The CR7 Timeline. (@TimelineCR7) November 11, 2020
Look at the movement. The jump. The header. :ok_hand:
And Clegg tips him to end up moving ahead of Josef Bican, Romario and Pele and topping the all-time goalscoring charts by the time he hangs
"He will score more goals than Becan," Clegg predicted.
"Ronaldo will change his way of playing, maybe his role too, as it happened with Giggs. He's going to stay close to the top because he's obsessed with being the best ever."
"He trains a lot, he takes care of recovery and sleep, he has a cook, he knows how to avoid stress.
"He is attentive to details, this is the secret even if an injury can always arrive, it is not 100 per cent predictable."
Bican, who scored 395 in 217 games for Slavia Prague, is said to have notched more than 805 goals in his decorated club and international career.
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