Chelsea's interim boss Rafael Benitez insists he knows the key to reaching what would be his first FA Cup final at Wembley after winning the trophy at the Millennium Stadium with Liverpool in 2006.
Benitez, whose side lie in third place in the Barclays Premier League, seven points behind second-placed City, said: "They're a good team, in a good position in the table and did well against Manchester United the other day.
"We know it'll be difficult, but it's a semi-final in a massive competition.
"We know what we did wrong against them in the league and we'll make sure we don't make the same mistakes.
"They're a good team, a strong squad. They have a manager (Roberto Mancini) with experience and they have confidence at the moment. We know we'll have to do our best if we want to progress."
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Chelsea vs Man City Starting XIs
Chelsea: Cech; Azpilicueta, Ivanovic, Luiz, Bertrand, Ramires, Mikel, Hazard, Mata, Oscar; Ba.
Subs: Turnbull, Moses, Torres, Terry, Benayoun, Ake, Lampard
Man City: Pantilimon, Zabaleta, Clichy, Kompany, Nastasic, Barry, Milner, Y Toure, Nasri, Aguero, Tevez.
Subs: Hart, K Toure, Lescott, Kolarov, Garcia, Sinclair, Dzeko
Meanwhile, City manager Roberto Mancini has expressed his determination to get his hands on the FA Cup again to feed his hunger for trophies.
Mancini has been a serial winner throughout his managerial career in Italy and England, claiming nine major cups or league titles.
The most recent of them was last season's Barclays Premier League title, an achievement which complemented the three Serie A crowns he won in charge of Inter Milan.
In knockout competitions he won the Coppa Italia four times with Fiorentina, Lazio and Inter before claiming the FA Cup as City boss two years ago.
With this season's league title seemingly out of reach, it is the cup that again represents his best chance of winning more silverware, although there is a tough semi-final against Chelsea to negotiate this weekend.
Mancini said: "I like to win the FA Cup or Premier League - it is important to win.
"In England the FA Cup is an important trophy. We have this chance.
"I don't think it will be easy because Sunday we have a difficult game, and then after the final, but it will be important.
"Every game against Chelsea is difficult. They are a good team in their best moment this season, doing very well and I am happy for (Rafael) Benitez because he is a good manager."
Saturday's FA Cup Results