The Hammers lost 2-0, despite facing ten-men for much of the game and seeing Alessandro Diamanti miss a penalty.
Zola said: "Our next two games will tell us a lot, especially the next one when we are playing against a team who are more or less in the same position as us. It will be massive.
"The players did not look like they had lost confidence, they were playing against one of the best teams in Europe and played some good football.
"We will go into the Wolves game in good shape."