Flores feels his front men need to be explosive.
He said: "Forlan and Aguero must improve on their aggression. I hope Diego and the rest return and maintain good efforts and a steady work rate," Flores told the press ahead of tomorrow's game.
"They have to be aggressive in front of goal. That goes for all the strikers in general, not just Diego.
"Those who play up front have to improve in the final third as when you score you always feel happy, and this is good going forward."