Jude Bellingham was caught on camera using an explicit phrase during Real Madrid's win over Alaves.
Los Blancos climbed above Girona to the top of the table, with Lucas Vazquez's last minute winner ensured Carlo Ancelotti's side at the summit for Christmas.
Real were frustrated for large spells at the Mendizorrotza Stadium and Bellingham received a caution at the end of the first-half.
The England international went into the book for his reaction to referee Isidro Diaz de Mera not giving an opponent a yellow card following a foul.
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He proceed to launch an angry tirade, with cameras picking up exactly what the former Borussia Dortmund midfielder said.
Fans didn't need to be lip-readers to understand that Bellingham told the man in the middle, "you're f***ing s**t”.
It's not the first time an X-rated remark from Bellingham has been heard as during the World Cup over a year ago, he appeared to shout, "Aaaargh, you f***ing c***!" when he was unsuccessful in keeping the ball in play.
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The 20-year-old plays on the edge with an unrivalled level of passion but there have been some calls him to calm down.
However, Ancelotti does not believe he has to change his behaviour in the slightest.
As per Goal, he told reporters: “It has not been a protest. It has been a foul in which they have not taken out a card. He doesn’t have to change his attitude because that’s how he has scored 17 goals.
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"He doesn’t have to change anything he does in the field because he’s making it spectacular.”
Bellingham has been a revelation at the Santiago Bernabeu, already notching 17 goals in all competitions after his £88 million move.
He and his Real teammates will now have a much-needed rest, with their next La Liga fixture against Mallorca on 3 January.
Topics: England, Jude Bellingham, Real Madrid
Josh Lawless