The Portuguese legend spent a season-and-a-half at United during his second stint at Old Trafford.
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Ronaldo scored 24 goals for the club last season, but was unable to repeat those levels this term.
He eventually departed the club via mutual consent in November before joining Saudi Arabian side Al Nassr in January.
Ronaldo is considered one of the greatest players of all time, so there's no surprise he had a big influence in the United attack.
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So much so that The Athletic have reported how one of the club's forwards kept passing the ball to the 38-year-old in attacks.
Analysts at United realised it was because they wanted to receive praise from the footballing legend, with the player struggling for form in doing so.
Ronaldo scored just three goals and assisted another two in 16 games for United this season before he left.
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His form for Al Nassr has been much better though, with the forward netting 11 goals.
However, he has failed to score in his last three appearances for the club.
Al Nassr were recently beaten 1-0 by Al Wehda in the semi-finals of the King's Cup.
Ronaldo was visibly frustrated with his side when they trailed at the break, and hit out at the bench as he walked off the pitch.
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Their exit from the competition sees him face a second season without a trophy, which could happen for the first time in his illustrious career.
Al Nassr could still win this season's Saudi Pro League, but they sit 2nd and three points behind Al Ittihad, who have a game in hand.