The Argentine, 26, also stated that another win for Roberto Mancini's side could have an impact on the Premier League title race.
"If we knock United out of the FA Cup that could have repercussions in the fight for the Premier League title, but right now we are thinking only about Sunday's game," Zabaleta told Goal.com.
"They will have the 1-6 at Old Trafford very fresh in their minds and they will want to get their own back. But the situation this time is different and now they are the ones who will be playing under more pressure."
Zabaleta has made 13 appearances for City so far this season.