VAR officials made a ''really, really poor'' and "unacceptable" decision not to award Rangers a penalty against Celtic in Sunday's Scottish League Cup final, admits Scottish FA head of referee operations Willie Collum.
The Ibrox side, who lost the final on penalties after a 3-3 draw, were awarded a free-kick in extra time when Liam Scales was penalised by referee John Beaton for a pull on Vaclav Cerny right on the edge of the Celtic box.
Footage shows that the infringement started outside the area but continued inside the 18-yard box.
Collum has said VAR officials Alan Muir and assistant Frank Connor moved "far too quickly" in their analysis of the incident and were "not forensic enough".
"People will obviously hear me say that it's wrong, but that's not enough," he said on the Scottish FA's VAR Review show.
"We need to now understand why did we get it wrong and how do we make things better, how do we improve, what's the lessons learned from this incident, because people will find it very hard to accept this error.
"It's a really, really poor decision. It's an unacceptable decision. The VAR team know that, everyone in refereeing knows it.