Signed in the summer for a club record ?38million, Aguero has taken no time to adjust to Premier League life. The Argentina star bagged two more goals in Wednesday night's win over Stoke to take his overall tally to 15, 13 of which have come during City's surge to the Premier League summit.
Mancini said: "I hope Sergio can score 30 goals. It is the same for Edin (Dzeko) and Mario (Balotelli). If they scored 50 goals between them it would be good for us."
Although it was generally acknowledged across Europe that Aguero was a player of exceptional talent, he could hardly have been expected to open his City career in such prolific fashion.
He joined the club at the end of July, when he came off the back of an arduous and unsuccessful Copa America campaign with Argentina. Normally, players who have taken part in the South American championship either start slowly due to their lack of a pre-season programme, or flag after a couple of months because of tiredness.
Aguero has so far avoided both problems.
Mancini said: "Sergio is very strong physically. He is not tall but his strength is amazing.
"Also, he has always scored goals in every championship. For this reason I don't think he has had any problems. He is still only young and maybe now his value is even more because he has scored 15 goals in three or four months.
"He has the confidence to score even more but what is important at the moment is that he has improved our team."