While an era of domestic dominance ended abruptly last season there have been continental warning signs sounding out of Parkhead for a number of years.
The single leg defeat to Ferencvaros last season was the blue touch paper that led to Neil Lennon revealing a host of his first-team stars wanted to leave.
That wild night set in motion a season to forget and Celtic appear to be still trying to piece things back together after a period of historic success.
New boss Ange Postecoglou will take charge of his first competitive match tonight but Chris Sutton and many others with Parkhead connections insist he shouldn’t be blamed if things go wrong against Midtjylland.
It’s clear Celtic need new signings but Postecoglou has turned to the tried and tested names in his squad for this match.
The stakes are high and 9,000 supporters will be in attendance hoping their side can give them something to cheer about once again.
Celtic: Barkas; Ralston, Bitton, Welsh, Taylor; Soro, McGregor; Christie, Turnbull, Abada, Edouard
Subs: Bain, Hazard, Griffiths, Ajeti, Rogic, Bolingoli, Urhoghide, Shaw, Murray, Forrest, Henderson, Montgomery
Midtjylland: Lossl, Hoegh, Sisto, Evander, Dalsgaard, Sviatchenko, Paulinho, Anderson, Dreyer, Nwadike, Brumado