Many have questioned Arsenal's hunger, desire and mental toughness in recent weeks, with just one win in nine matches before the victory over Sir Alex Ferguson's men.
But having seen his team deservedly beat the league leaders, the Frenchman claims that result proves that his squad have what it takes to lift silverware in the near future.
Wenger said: "When you listened to everybody before the game, we had no chance to take any points, but we won so let's keep believing in ourselves.
"Despite the disappointments, the group is healthy, ambitious and there is a lot of quality."
Arsenal last week