City underlined their Barclays Premier League title credentials in emphatic fashion last time the sides met, thrashing their rivals 6-1 at Old Trafford in October. Now, as league leaders, City could make another strong statement by launching their FA Cup defence with another win over their neighbours and closest challengers - this time at home.
But Hart said: "I am not bothered about statements - I am bothered about winning the game on Sunday. We want to win every game, regardless of what cup it is in. If you do win every game you win trophies, and that is what we want."
Hart accepts United will want revenge for the humiliation they suffered at City's hands last autumn.
"Of course they do but that is for them to feel," the 24-year-old England number one said. "We have got to focus on our game.
"But it has gone, and it has gone for them as well because they have produced some great form since.
"It is nice for the fans to have those memories and those bragging rights but as far as the players are concerned that has gone.
"Sunday is another big game."