West Ham United manager Slaven Bilic was disappointed with his side's defending in the first half as they suffered their first defeat of the season at home to Leicester.
After producing such a memorable victory over Arsenal in the opening league game last week, the Hammers players failed to show the same kind of momentum in the opening 45 minutes and gifted two goals to Leicester.
Shinji Okazaki and Riyad Mahrez scored the crucial goals that helped the Midlands side maintain their 100 per cent winning start to the campaign.
Bilic was more encouraged by the second half display which saw Dimitri Payet help his side get back into the game, but knows his side need to work on their defensive mistakes before they face Bournemouth at the Boleyn Ground next Saturday.
Bilic said: “We are disappointed and basically we lost the game in the first half. We started well in the first ten minutes but they were winning all the second balls and we couldn't cope with their pace.
“They did it against Sunderland and put the ball in behind you. We were second best in that department and didn't pass the ball quickly enough to switch sides and make them tired.
“In the second half we were much better introducing Pedro Obiang because he gave us the quickness of the game that we didn't have coming from right side to left side.
“I told the players at half-time that we need to keep the shape and belief and play with more aggression. It was all about that first goal and when we scored it we had enough time to score another one. We had a couple of good chances but we couldn't score another goal.”
Bilic had no complaints over the dismissal of Adrian but is now more concerned over how many games the Spanish keeper will be ruled out for.
Bilic added: “I have no complaints about the referee's decision. I am more worried about the sanction and how many games we will be without him. The major part of the decision is if he did it deliberately or not and he clearly went for the ball.”
Bilic is confident the players will react quickly to the defeat and put things right when the Hammers play another home game next weekend.
Bilic added: “We have to work hard and fight and I'm sure our quality will make the difference. We cannot wait for the Bournemouth game and want it as quickly as possible.”