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The situation in the north east has turned ugly given Isak's recent defiance, with the player training separately from the first team after missing Eddie Howe's pre-season tour of Asia.

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And Butt, who played for the Toon Army between 2004 and 2010, believes that Isak's behaviour should come as a major red flag for Arne Slot and Liverpool.

Speaking exclusively to Mirror Football via BetMGM, the 50-year-old said: "I've never met Isak in my life, he always looked like a really decent guy on the football pitch, but I think the way he's behaved has been really disrespectful to the football club and knowing what the fans are like up there, you know, I wish him all the best."

He added: "It would be a red flag for me if I was a manager, but you don't know what's been said to the boy.

You might have said the only way you're getting out is by going and kicking up a fuss, and if this is your dream to play for this football club, then you've got to go and maybe be out of character for a while.

"So you don't know what goes on, and I think there's a lot of games with agents in modern day football, and it's just sad.

I mean, I'm sure if Isak went into the football club and said, 'I want to play for Liverpool or my boyhood club or whatever that might be, and I need to leave, I don't want to kick up a fuss, but I will do if you don't help me out here...'

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"I think once someone says that to you, you better off letting them go.

Isak scored the winning goal in the final of the tournament against Liverpool to clinch silverware for the club.

He explained: "Yeah, I think it's sad, isn't it, after an amazing season for Newcastle and the fans, and the manager, and the players and everyone associated with Newcastle.

He can go and he can get the money and go and find players that want to play for that football club, and I think that's the most important thing.

"It's really tough to come back from that, because if you're doing the right things around your peers and within the changing rooms, you can always try and win fans back, if you like.
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