The Rangers forward went down in the box early on in the goalless draw.
While the incident was briefly reviewed, no spot-kick was given.
Former English Premier League referee Dermot Gallagher agreed with the decision of referee Don Robertson and VAR official Andrew Dallas not to award a penalty.
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Speaking on Sky Sports News’ Ref Watch segment, Gallagher said: “I didn’t think it was a penalty.
“Scales was just too strong for him.
“He almost bounces off Scales, rather than the other way around.”
Former Cardiff City striker Jay Bothroyd agreed and said: “He’s trying to win a penalty, he’s looking for it, and I don’t think that one is a penalty.”
The opinions of Gallagher and Bothroyd agree with what Scales himself said. Speaking immediately after the match, the Celtic defender issued his verdict on the incident.
He stated [Sky Sports]: “I think VAR and everything, I don’t think it could’ve been [a penalty].
“Even if the ref gave it, I think it would’ve been overturned.
“You could say it’s diving.
“He initiates contact, so he just has to be careful with that.”