Mancini believes the Argentinian will settle into the Premier League as soon as he completes his switch to the Etihad.
He said: "Aguero is young and can start to score a lot. He will become a top striker. He is 23 and now is his time.
"He can play as first striker or second striker. He has good technique. After many years in a top club like Atletico Madrid he can play Premier League.