Roberto Mancini felt Manchester City learnt "an important lesson" from their 2-2 draw at Leicester in the third round of the FA Cup.
A second-half blunder from Eastlands keeper Joe Hart gifted Andy King the equaliser, but Mancini's side looked vulnerable all evening against set-pieces after Leicester newcomer Sol Bamba scored inside 50 seconds.
Mancini said: "For us, it is an important lesson, that if we want to win the FA Cup we must always play at 100% because every game is difficult. We conceded a goal after one minute which was very strange. I think we slept for two or three minutes."
He added: "They caused a lot of problems from set-pieces and Bamba is good in the air, very tall, and a big problem. We will have to work on that for the replay. When we play at Eastlands, we must pay attention.
"I think we played 100% but maybe sometimes, when you play a team in the Championship or the third division (League One), you think 'that is easy'.
"In the FA Cup there is never an easy game. We want to go to the final.
"It is important when we play other teams, we must focus on the game like when we play in the Premier League. But it is important we have another chance."
New £27million striker Edin Dzeko looked on from the stands and will make his debut against Wolves next weekend.
Mancini said: "He will be an important player for us. He is different from the other strikers we have. He is one more choice for me.
"He will be very important for the rest of the season, important in the next match. He will be available for Wolves in the next game."
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