Once the hysteria of Sunday's unlikely cup win – and the fallout from the Ibrox pitch invasion – eventually fades, perhaps Celtic fans will ask themselves: 'How did we win that?'
Registering just one shot, which was off target, compared to Rangers' 24, Martin O'Neill's resolute side managed to drag themselves to extra time before breaking their rivals' hearts in a dramatic Scottish Cup quarter-final penalty shootout.
It will forever be unknown what influence injured captain Callum McGregor would have had on Celtic's performance, but many have suggested his absence played a big part in the lack of control from O'Neill's men.
One week on from the 2-2 draw at the same venue, Celtic's possession dropped from 55% to 41%, while their passing accuracy went from 78% to 72%.
Perhaps that was down to a change of approach, as well as the missing presence of their midfield dictator, with the away side opting to go long with 17% of their total passes, as opposed to 9% the previous weekend.
It is also very possible this change of approach was encouraged by there being no McGregor to play his usual in-possession role of constantly offering himself as a passing option as Celtic aim to dominate the ball and build attacks.
The 32-year-old has at times been criticised for not performing at his top level amid a turbulent season for the Parkhead side, although there will now be fears about how long the former Scotland international will be absent for at such a crucial stage of the season.
But how have Celtic coped without McGregor in the past?
Trying to find a suitable sample size to answer that is difficult, given the amount of games the midfielder plays. He has played in every league game this term and has missed 13 across the previous three Premiership campaigns.
In those 13 matches, Celtic have won 11, which suggests they can cope without their captain, losing the two others – Rangers last term and Hearts the season before.
However, the caveat is this is a far weaker team in terms of quality and availability, with fellow midfielder Arne Engels out and leader-like characters Cameron Carter-Vickers and Alistair Johnston also still missing.
