West Ham boss Slaven Bilic and his players have been told to buck up their ideas by the club's co-owner David Sullivan.
The Hammers' poor form continued at the Vitality Stadium on Saturday as they crashed to a 3-2 defeat to Bournemouth.
It was the Londoners' second straight defeat and stretched their winless run to four matches, and Sullivan is demanding an improvement.
"I was very disappointed and frustrated with the manner of our defeat at Bournemouth on Saturday," he told the club's official website.
"We went down there determined to bounce back from the Chelsea defeat on Monday, but we didn't play as well as we know we can.