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Cristiano Ronaldo notched his 10th 4-goal game for both club and country in Portugal's 5-1 win over Lithuania.
Jose Mourinho has said Cristiano Ronaldo's mental and physical form is worthy of a case study.
The Juventus forward scored four goals as Portugal beat Lithuania in a Euro 2020 qualifier on Tuesday to increase his tally to 93 international goals.
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Ronaldo, who achieved his eighth hat trick in international football against Lithuania, surpassed Robbie Keane to become the all-time record scorer in European qualifiers on 25 goals.
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"It doesn't surprise me," Mourinho, who coached Ronaldo at Real Madrid for three seasons, told Portuguese TV.
"At 34, he is top in the world, in a top team, in top condition. I'm not surprised whatsoever because genetically and mentally he is a case study.
"He is someone that only thinks about winning, about beating records, achieving more and becoming better. He is truly a phenomenon and it really doesn't surprise me."
Only Iranian legend Ali Daei with 109 has scored more goals in international football than Ronaldo.
Mourinho joked the five-time Ballon d'Or winner will continue scoring even after he retires.
"When he is 50 years old he will be at home and FIFA will invite him to a game of legends," Mourinho said. "He will play the game and score a goal. I am sure it will be like that."