West Ham captain Kevin Nolan has revealed manager Sam Allardyce called a 7am meeting the morning after the 5-1 loss to Arsenal in order to draw a line under the defeat.
The Gunners scored four times in 10 second-half minutes to claim a Barclays Premier League victory at the Emirates Stadium, extending the Hammers' winless run to five games.
"It was totally unacceptable for us with the standards we have set ourselves," Nolan said on www.whufc.co.uk. "The gaffer wasn't happy and rightly so - so he asked for us to come in at 7am the next morning on the Thursday. There were no complaints from any of us - we all need a kick up the backside every now and then and we take it all on board."
He added: "The gaffer and all of us wanted to put this result and what happened to bed straight away, and it was good that we came in early and got into looking at what went wrong together as a group."
Mohamed Diame was late for the meeting and his team-mates wondered if they would see him again.
The 25-year-old, who joined the Irons last summer from Wigan, maintains he is happy at Upton Park, despite being linked with a move, should a club match the £3.5million release clause in his contract.
Nolan added: "We all had to wait for him before we could start and when he arrived, we all gave him stick for not only being late and keeping us all waiting, but we said we thought he had left us without saying goodbye."
Daniel Potts suffered a head injury in the loss to Arsenal but is now recovering after being released from hospital.
Already out of the FA Cup, the Hammers side are looking ahead to making amends for the Arsenal loss at Fulham on Wednesday night.
"We have all taken it on board and on the chin," Nolan said. "The outcome is that we are looking forward to putting it right against Fulham next week."