Rangers goalkeeper Jack Butland admits he finds it "difficult to accept" the decision not to send off Celtic defender Auston Trusty in Sunday's Scottish League Cup semi-final.

Trusty's boot appeared to connect with Butland's head before being shown a yellow card from referee Nick Walsh with no VAR intervention.

The ruling left Rangers "concerned" with Celtic going on to win 3-1 in extra-time.

"Was there a massive amount of malice involved?" Butland asked.

"Not necessarily. You'd like to think that you're protected, in a sense, from things like that.

"Seeing it afterwards, it was perhaps later than I thought in real time as well. So, a difficult one to accept.

"Difficult to accept that that's perhaps a precedent that is going to continue if that's a similar situation against any team, regardless of who it is.

"Obviously, with the addition of all the assistance that the referees perhaps get nowadays, we can only hope moving forward that the right decisions get made and it stays as fair as it possibly can."

Butland was speaking after Rangers suffered their fourth Europa League defeat of the...