Rangers has confirmed they “remain unsatisfied” after chief executive Patrick Stewart met with Scottish FA head of referees Willie Collum to seek an explanation over the refereeing of the League Cup semi-final.

Celtic went through to next month’s final against St Mirren with a 3-1 extra-time win after what was an incident-packed match.

Johnny Kenny had put Celtic in front at Hampden before Rangers were reduced to ten men following Thelo Aasgaard’s challenge on Anthony Ralston.

However, Rangers believed Celtic should also have had a man sent off just before half-time when Auston Trusty’s boot made contact with goalkeeper Jack Butland’s head when the Englishman had both hands on the ball.

Match referee Nick Walsh decided there wasn’t force behind the contact and showed the USA international defender a yellow card but some Rangers players were furious it wasn’t red. VAR officials backed the on-field referee and didn’t ask him to revisit his decision on the monitor.

The club says they “remain unsatisfied” following a meeting with the Scottish FA to discuss major decisions during the semi-final.

Rangers believe the VAR process following the incident between Trusty and Butland was not “sufficiently robust or thorough”.

The Glasgow side doesn’t believe there has been “enough change in how...