Aguero feels deals for Alvaro Negredo, Stevan Jovetic, Jesus Navas, Fernandinho and Martin Demichelis have City in better shape to push for more silverware in 2013/14.
He said in The Sun: "Carlitos has moved on and he was a great team-mate.
"He's going to be missed but we wish him the best in his next step.
"But I always keep a close eye on Spanish football and Jesus Navas and Alvaro Negredo were two of its brightest stars.
"Having them in our side makes us stronger - the same applies to Fernandinho and Stevan. They are amazing players."
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