The Fir Park side are firmly in the running to land the runners-up spot in the SPL, and the victory over Neil Lennon's side could well be pivotal in trying to hunt down that spot.
McCall has now called upon his side to show the same appetite when they go to Edinburgh this weekend for their game against Hearts.
"We stressed before the game what we needed but now we need that same level of enthusiasm and energy at Tynecastle on Saturday," he said.
"I don't think the position is that important at this minute in time because you can be second one week and sixth the next but we got three points on board last night and no-one expected that.
"I'd have taken a point before the game. That isn't being negative. But that was a big result for us," added McCall.
And while Motherwell took a lot of plaudits for the adventurous way that they lined up against Celtic, McCall was also pleased with the way they defended against a forward line of internationalists.
"Young Adam Cummins doesn't get much of a mention but I thought he was outstanding for us," said the Fir Park boss.
James McFadden returning to his old stomping ground said: "I haven't played much football over the last two and a half years and I haven't started a game since last May."
"I felt I did myself justice tonight. I worked hard and put in a shift for the team."