Rangers fell to a penalty shootout defeat against Celtic in the Scottish League Cup final.
But there was a huge potential spot kick that evaded Rangers before then that should've been given or at least checked by VAR, according to Bobby Madden.
Vaclav Cerny's shirt was evidently being pulled by Celtic centre-back Liam Scales both outside and inside the penalty box.
Despite that, on-field referee John Beaton didn't give a penalty and wasn't instructed to consult VAR for a check. Instead, a free-kick was awarded.
"This is 100 per cent a penalty kick," the ex-Scottish FA whistler wrote on Instagram. "It doesn't matter when the holding started, when it ended or what direction the players are moving.
"This is clear evidence of holding within the penalty area and I'm amazed this hadn't been identified by VAR. Referee team had been excellent until that point. Difficult live, but that's why VAR is there."