Rangers will get one final crack at Celtic in an ultimate Old Firm derby before returning to the top flight at the end of the season, after the two were drawn together in the Scottish Cup semi-final draw.
Rangers and Dundee United booked their places in the semi-finals of this season's William Hill Scottish Cup on a dramatic day of cup action.
A stunning Harry Forrester strike after only 13 seconds set the tone as the Championship leaders ran amok at Ibrox against their Premiership opponents.
Former Celtic defender O'Dea earlier called for Rangers to be stripped of league titles won during the years when many players were paid via employee benefit trusts (EBTs), amid an ongoing legal dispute between the tax authorities and Murray Group, former owners of the oldco club. After his team's dismantling of Dundee at Ibrox on Saturday, the veteran striker said they were more than capable of going all the way.
The semi-finals will take place on 16 and 17 April 2016.
Rangers will be aiming to be the first side from a lower division to win the Scottish Cup since East Fife in 1938.
Van Gaal impressed by youthful Manchester United
I give them 20 minutes and then 50 minutes and 70 minutes and I have to do that within Premier League matches. But despite Mata's recklessness with the challenge on Fletcher, Van Gaal refused to condemn the Spaniard.
The Dee have to go back to 1910 for their one and only Scottish Cup glory year - a wait nearly as agonising, and as surprising given the stature of the club, as the one famously endured by Hibernian.
"They know what playing for Rangers is all about now - the penny has dropped for them really, really quickly, and you can see it in the way we play, when we score a goal and when the lads talk about it after a game".
When you are about to enter the lion's den and face the prospect of 40,000 or so paying customers baying for your Scottish Cup quarter-final demise, the last thing you want to do is attract further ire. "It was a big challenge and we knew the danger they posed but from the outset".
"I think the last time was a bit of a mismatch but this time it'll be the real McCoy back again. When we perform well we are better than Morton and that's what I'm focused on and I don't think there will be a problem with attitude ahead of this game".
"We've been good defensively recently but today it just wasn't the case and I can't explain that, I can't put my finger on it".
"Yes, it's a game to look forward to, absolutely, but our priority has to be the league campaign". The quality dipped a little in the last 10 minutes of the first half.