Harry Maguire was overheard shouting "Lino, you're allowed to f****** tackle!" after the referee's assistant flagged for a foul against Manchester United.
The Red Devils captain made a nervy start against Newcastle at Old Trafford on Sunday, and was even seen having words with Fred after a mix up in the United box.
This isn't the first time Maguire has been heard shouting at a referee's assistant, after he made his frustration with one known in United's recent 3-3 draw with Everton.
The Red Devils captain was defending United's precarious 3-2 lead over the Toffees when fellow England international Dominic Calvert-Lewin fouled him.
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