Wenger has so far this summer just signed Belgium defender Thomas Vermaelen from Ajax.
“It’s great to have a young team but youth doesn’t give you titles,” Almunia told Champions magazine.
“To go a step further players need to demand more of themselves, be more professional, braver in big games.
“We need the manager to work harder to get what we need, the club to make an extra effort to make us more competitive. We need more than youth.”