GMP will be able to handle this.
They can handle big events occuring all over the city at the same time.
My only concern is areas such as Piccadilly Train station where we will have City>United>Wolves>Palace fans all over the show hopping on/off trains.
Same with the Metrolink.
To be fair to the Swamp dwellers though, I've come across many in recent years in town and never had any issues - maybe a little banter when I've been wearing colours - but I've just smiled and carried on walking.
Such a busy area you can somewhat go unnoticed.