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Andy Robertson(Image: Getty Images)

Scotland captain Andy Robertson appeared to let his competitive streak get the better of him by slating a Liverpool team-mate in an X-rated training ground rant.

Arne Slot's side are gearing up for the defence of their Premier League title with a tour of Asia and will take on J1 League outfit Yokohama Marinos on Wednesday after losing 4-2 to AC Milan last weekend.

And ahead of the game, Robertson - who is into the final 12 months of his contract at Anfield - could be heard giving 16-year-old starlet Rio Ngumoha a stern telling off during a training exercise.

In footage shared on X by The Redmen TV, the teenager appeared to lose the ball, promoting Robertson, 31, to bellow: "Ah Rio, f****** complacency ya wee d***".

Robertson didn't hold back in his criticism of Ngumoha for losing possession of the ball

The rant was clearly in jest, with the Tartan Army hero recently talking up his younger teammate.

Ngumoha became the youngest ever player to start a game for Liverpool when he lined-up in an FA Cup clash against Accrington Stanley back in January and former Dundee United and Queen's Park full-back Robertson has predicted a big future in the game for the England youth international.

Speaking about Ngumoha and fellow prospect Trey Nyoni in an interview with The Anfield Wrap, he said: "He’s a good kid and he’s got a fantastic head on his shoulders, especially when he’s got people like Mo [Salah] who can help him so much as well.

"We always try to help him and Trey.

"They’re so young but they’re such good kids and they’ve got a hell of a future ahead of themselves.

Liverpool's Rio Ngumoha (right)(Image: AP)

"You can just see them coming on every time and the more they train and play with us, the more they just get better and better.

"Obviously that’s the last two games I’ve played now with Rio in front of me and he just keeps on coming on.

"He’s got a hell of a future ahead of him but the here-and-now looks pretty good as well."

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