West Ham boss Slaven Bilic was delighted to win a first Premier League game at the London stadium.
The Hammers beat Bournemouth 1-0 on Sunday.
Bilic said: "The atmosphere is brilliant!
"I'm a big fan of Upton Park, I'm not paid to hail the new stadium if I don't like it, I like those freezing cold stadiums.
"But I felt the fans, it was proper loud. So it's up to us. As long as we are winning and competing and they are going home happy, then they are going to pack this stadium."