Slaven Bilic had no excuses for his side's disappointing display against Watford but hopes it is a one-off and wants to see his team get straight back on the winning trail against Everton next weekend.
Two goals from Odion Ighalo inflicted the first away defeat on the Hammers this season who failed to hit the standards that have seen them record memorable victories over Arsenal, Liverpool, Manchester City and Chelsea.
The day was compounded when James Collins received a red card late in the game and Bilic says the performance was unacceptable.
Bilic said: “I am very disappointed with the defeat. It is normal to be beaten but not in this way.
“With the greatest respect to them we helped them with our approach and it was more down to attitude. If you start like this they are growing with confidence and you are on the back foot.
“I said to the guys it is unacceptable but we have to make sure it is a one-off. We deserved to be beaten.
“We can say their goals were down to our own mistakes but they should have scored before and they were simply better than us. They were more hungry and were ready for our mistakes. There are no excuses.
“Andy made a mistake and you can't gamble in front of your goal. You cannot take that risk and he should have kicked the ball out to the stands. He opted to dribble and they scored from it.
“We made a couple of changes at half-time and to be fair I wanted to make more but it was too early in the game. Unfortunately we conceded a goal from an error early in the second half.
“If we could have scored after that we would have a chance to get a point, but we didn't deserve it and that is why I am very disappointed.”
Bilic wants to see an immediate response from his players when they face Everton next Saturday and hopes the players will quickly regain the form they have shown in the opening ten games of the season.
Bilic added: “That is what we have to do. Nobody likes to be beaten but not like this. We gave them a hand and they took the opportunity.
“We paid the price but let's be sure we can work as hard as them to win a Premier League game.”