The Portuguese superstar scored Manchester United's second goal of the match away at FC Sheriff Tiraspol, which saw the home crowd join in his iconic 'SIU' celebration.
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Jadon Sancho scored the opening goal as Man United ran out comfortable 2-0 winners in Moldova.
Ronaldo had a turbulent summer transfer window in which his agent held talks with Chelsea and Bayern Munich in an attempt to secure a Champions League return, but none of these efforts came to fruition.
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Instead, Ronaldo ended up staying at Old Trafford, and is now playing in the Europa League for the first time, ending a 19-year stretch in which he only played in Europe's top tier.
That didn't stop the 37-year-old adding to his astonishing goalscoring record though, returning to the line-up against Sheriff to score his 699th career goal from the penalty spot.
And despite his attempts to get away from the Europa League, Ronaldo still celebrated his first goal of the season in trademark fashion with a run, jump, twist and landing, followed by a shout of 'SIU'.
And despite the game being away from Old Trafford, the home crowd still joined in, showing the legends impact is far from tarnished despite his lack of game time this season.
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Ronaldo was a key fixture in United's opening losses of the season against Brighton and Brentford.
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Ronaldo was a key fixture in United's opening losses of the season against Brighton and Brentford.
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New manager Erik ten Hag then took the bold decision to drop the five-time Champions League-winner to the bench for the following match against rivals Liverpool, which resulted in a victory.
In fact, Ronaldo hasn't started since in the Premier League for the Dutchman, where United have picked up four straight wins.
But with no chance of a transfer until at least January, Ronaldo needs to get back down to business, and will likely have received some motivation from the Sheriff fans after bagging his first of the season.