The Hammers lost 4-0 at home to United but Zola was proud of the efforts of his players.
“I think the first goal completely changed the story of the game,” he told Sky Sports.
“We were defending very well and they were not creating very much. That goal at the end of the first half made the game go in a different way.
“No complaints because the players gave everything and when you play the champions it is always difficult. If you give them something they will exploit it.
“I think 4-0 was too much but that is the way it is. I think the second goal killed us a little bit as well.”