Such is the rivalry between the Old Firm sides that sparks fly just at the possibility of them meeting.
Celtic haven't met Rangers for some time but a derby clash is now very much a possibility, with both sides into the last four of the Scottish League Cup.
And that possibility prompted Celtic striker John Guidetti to assert that any team the Bhoys face in the semi-finals is 'going down' after scoring a hat-trick against Partick Thistle in the last round.
But Rangers boss Ally McCoist has hit back at those claims - taking a little dig at the Swedish striker.
"With the greatest of respect to John, I remember getting excited about my first hat-trick - but against 11 men,’ McCoist is quoted as saying by the Daily Mail.
"Listen, he’s entitled to his opinion and that’s the way it is. But maybe, just maybe, he’s got caught up in the excitement of scoring his first hat-trick for Celtic - which, of course, we congratulate him on."
Meanwhile, the Rangers boss also responded to Celtic manager Ronny Deila's claim that the 'best teams are in the top division.'
"In normal circumstances, he would be right," McCoist continued. "But in the last few years nothing has been what it seems in Scottish football. We’ve had anything but normal circumstances.
"You have three of the five biggest clubs in the country playing in the Championship.
"That would tell us it’s not normal circumstances. If it were normal then, yes, the three teams in the top-flight would be stronger than the team from the division below. I understand Ronny but I don’t necessarily agree with him."