City leapfrogged Chelsea into third place in the Barclays Premier League with their emphatic home victory over the Black Cats.
It made for an interesting Sunday afternoon's entertainment for Manchester United manager Ferguson, who viewed the game from the stands at Eastlands ahead of his side's cup showdown with City at Wembley on April 16.
But asked if he thought Ferguson might be concerned by what he had witnessed, Mancini said: "I don't think so. He knows the FA Cup semi-final is one game in which anything can happen, and I think he knows Manchester City very well - like we know Manchester United."
He added: "It was important for us to win this game because we had the chance to go into third position. Before the game I thought it would be difficult because it is not easy to beat Sunderland.
"They are a strong team who work very well and their manager knows everything. But we started the game brightly and that was important. I am surprised but I am happy. It is important that we scored five goals."
Source: PA
Source: PA