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With three years remaining on Isak's contract, Newcastle aren't compelled to sell without a fitting bid, and McCoist contends the player is facing the consequences of his self-imposed isolation from the team.
Speaking to The Mirror, McCoist didn't mince his words: "I think he's acted poorly.
And he echoed the sentiment that Newcastle are in control of the situation regarding their striker's future, even if it means he remains discontented at the club for the time being.
Ex-Newcastle coach Alan Pardew has suggested Isak couldn't have handled his situation much worse(Image: PA)
"The transfer to me looks like it can't be done because Newcastle are going to dig their heels in now, and I think they are angry," Pardew recently said on talkSPORT.
He couldn't have handled it any worse.
"His agents and advisors have said to him to throw down the tools after serving that great football club, and he's doing really bad things to hold them to ransom and more or less force a way out."
Gabby Agbonlahor was passionate in his criticism of the Swede(Image: talkSPORT)
Another pundit who is none too pleased and thinks Isak ought to face consequences is ex-Aston Villa forward Gabby Agbonlahor.
"He's obviously been advised to do that because the person I've seen talk and be around in Newcastle doesn't seem like that's in his character."
Kop legend Jamie Carragher believes Isak has "outgrown" St.
Nevertheless, they may not have anticipated just how successful the player would become in such a relatively brief period.
Three years on, and Liverpool legend Jamie Carragher reckons Isak has now "outgrown" his present club.
From Newcastle's point of view, they've got a player who's under contract, and they've got to weigh up the balance of the finances, what they could receive, maybe having an unhappy player, or maybe keeping someone against his will."
Alan Shearer has opted not to be too critical of Isak despite this summer's actions(Image: James Gill - Danehouse/Getty Images)
Newcastle legend Alan Shearer has taken a surprisingly measured approach regarding Isak's future despite many expecting him to side with the club.
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