Campbell was a constant thorn in the side of the City defence who were shorn of their key lynchpin - the injured Vinccent Kompany - with Joleon Lescott partnered by stand-in Javi Garcia.
His manager believes performances of this quality mean he could soon be adding
to his solitary England cap.
"I thought Fraizer Campbell gave their whole back four problems," said the Cardiff manager.
"He is someone I was delighted to get when we managed to get him in from
Sunderland for £600,000. I thought it was an incredible bit of business on our
behalf and he hit the ground running.
"He needed to get fit and he needed to get sharper and he needed to regain
belief in his own ability and that is what we gave him.
"I now think I have a player there who has had an England cap and, over the piece, I think could force his way back into that squad if he keeps his head down and keeps working and playing like that against top, top players."
Mackay also praised the strong support his side received from the home crowd as they claimed a famous victory.
"When the goals went in it was something quite incredible," he said.
"The stadium, the team, the staff and the fans did us proud today in front of
a worldwide audience.
"It is something that is going to be massively important for us going forward.
They are our 12th man."