Think of the Carling Cup, FA Cup, Champions League and World Cup all rolled into one, and that's just about the magnitude of the importance of the game for the Canaries tomorrow.
Well, at least that's certainly how 25,000 City supporters will be feeling right now with their team precariously perched just three points above the drop zone and having suffered an alarming drop in form recently.
It doesn't need building up this one, because with hardly the easiest of run-ins for City in their final six matches after tomorrow, it goes without saying that they have to fully cash in against the worst team in the division to prevent what could easily develop into an absolute disaster should they fail to do so.
A victory would allow everyone to breath easily, as although there would still be some work to do, with the task of staving off relegation just about nearing completion it wouldn't be beyond the realms of possibility to then see the Canaries proceed to cause a few surprises in their remaining matches.
The anxiety that would envelop Carrow Road at a stroke at the final whistle tomorrow though should City mess up again doesn't even bear contemplating.
Glenn Roeder and several of his players have openly accepted in interviews this week that tomorrow is crunch time as far as this season is concerned, and if positive thinking and saying the right things counts for anything then we can look forward to witnessing City rack up a cricket score tomorrow.
But as even the great Muhammad Ali once said though ? someone who wasn't exactly backwards in coming forwards at proclaiming his ultra-confidence ? ?No-one was ever knocked down with a few choice words…?
It's how Norwich go about their business from the first whistle tomorrow that counts.
Nerves and early apprehension is to be expected with so much at stake, but with the full backing of the crowd and enough in terms of quality and experience in the City side they should be able to settle quickly enough.
And then as usual it will all boil down to how the players perform individually and collectively that will determine the standard of the display that subsequently ensues.
The Canaries understandably seem a touch unsure of themselves at present, and it has lead to unconvincing performances in general.
True, City could, and would have secured more points than they have in recent weeks had they been more clinical in front of goal, and it would also be prudent to highlight that Norwich have gelled well together in spells on occasions and also demonstrated brief bursts of cohesive passages of play.
But the days when the Canaries travelled to the likes the likes of Blackpool, Barnsley and Cardiff, as well as here at Carrow Road against Sheffield United for example, and ripped their opponents to shreds for prolonged periods in games does seem a very long time ago indeed.
Will it change back for the better again tomorrow?
Well, we'll see, but in footballing terms the opportunity to open the valve on the pressure cooker and release a considerable amount of pressure won't get any better than this.
For their part tomorrow's opponents Colchester appear to be fighting a losing battle to avoid the drop into League One.
Relegation now seems inevitable for Geraint Williams' team, as with just 33 points in the bank and only seven fixtures left to play they will probably have to win all of their remaining matches in order to maintain their Championship status.
But considering that they have won a just six league games all season though, that clearly isn't going to happen.
Hence, the time has now arrived for City to duly fill their boots.