Overwhelming questions remain, however. How long will O’Neill Celtic improve?
His return, along with Assistant Shaun Malonon, brought a sense of purpose but it was short-lived.
The jokes of the O’Neill striker Farddays Fit disappear, while the problems of the deep problems of the Celtic problems of the deep problems.
Captain Callum McGregor was at the heart of Sunday’s delight, scoring the extra-time winner, but he quickly made sure nothing was taken.
“Nothing is resolved after a very good game at the weekend,” the midfielder said after losing to Denmark. “We know we’re not going to get as well or down.
“We came here against a very good side, a good club, who do a lot of good things and they know what they are.
“There’s a lot of growth left in our team as well. We know where we are and we know where we want to be.”
It appears Celtic are far behind, and it’s shaping up to be a Herculean task to get them there, for whoever is charged with getting them there.
On a topsy-turvy night, it won’t be the interim manager who takes the heat. Not even the players he coached.
This is the board that was able to stop giving up pointing in their direction for a few days with the return of O’Neill to feel the pressure once again.