Roberto Mancini is happy that City made it through into the next round of the FA Cup sponsored by E.ON, but far from satisfied with the goals conceded against Leicester.
An equaliser from Gallagher shortly after Carlos Tevez's superb opening goal, a strike from Dyer that made it 3-2 in the second half and a spirited display all round from Sven Goran-Eriksson's Foxes made it an uncomfortable night at times for City.
This followed Saturday's seven-goal thriller against Wolves, after which the manager had admitted City's defending was a concern to him. There was a similar reaction to Tuesday night's replay victory, with Mancini saying:
"It's great - but only for the supporters! I'd enjoy it if we scored four goals and did not concede any, but every time it's two goals, three goals. We must improve.
"We conceded these goals tonight because we lost our concentration, especially in the last 10 to 15 minutes. We thought the game was finished, but in football you must keep concentrating until the referee blows for the end of the game.
It is good for fans, but I prefer a 4-1, a 1-0 or a 2-0. If you don't concede a lot of goals, at the end of the season you are sure to win something.
If you keep conceding in each game, you will get to the moment when you don't score enough to win. Because of this, we have to improve."
City now face Notts County on Sunday, 30th January for a 2.00pm kick off, and following their shock win over Sunderland, Mancini is well aware of the potential of Paul Ince's outfit.
He added, "These are tricky games, and we have seen this with Newcastle and Sunderland. Notts County beat Sunderland away, so we are going to have to pay attention to them."