Chelsea are also interested in the Argentine.
"It is better that he (Aguero) goes to (Real) Madrid for 45 million euros than to another team for 25 million euros," Manzano said in El Larguero. "You always have to look for the best value in the market."
Aguero is thought to prefer a move within Spain and has hinted at the possibility of a move to Real Madrid, but Manzano admits the door is still open for the player to change his mind.
"The player is ours at the moment and I would love to coach Kun Aguero," said Manzano. "He would be received with open arms."