West Ham coach Slaven Bilic urged his team to recover the "brotherhood" they showed in their opening win against Arsenal after dropping a second consecutive game in Saturday's 4-3 defeat to Bournemouth.
The Premier League newcomers won at Upton Park on the back of a Callum Wilson hat trick, and Carl Jenkinson became the fifth West Ham player to be sent off in all competitions this season.
After having also lost 2-1 to Leicester the previous Saturday, back-to-back defeats mean the victory at Arsenal on the opening weekend seems a long way off.
But manager Slaven Bilic said his players may have still been thinking they were good enough to beat anyone after impressing against the Gunners.
"To me it was gone straight after the game against Arsenal," he said when asked about the positivity gleaned from that success.
"Straight after the game I tried to calm things down, it was a great game of course. Maybe after that game we started to think individually like, 'That is enough for us on the pitch', but the fact is we lost the game, I don't like this position.
"It is not time for alarms. I don't like the approach that it is still early days, I have to change it. We had that togetherness, that brotherhood [at Arsenal].
"First half against Leicester and Bournemouth it was not unit work or teamwork and then it is hard for everybody."
Although admitting his side were culpable of making errors in defence, Bilic was also quick to praise the display of the visitors.
"You can say that but it wasn't just that," he said about mistakes costing his side.
"I congratulate Bournemouth, they deserve it, they were good. Bournemouth scored goals -- for every goal you have to give credit to the opponent.
"First, second goal and fourth goal -- the ball was at our feet, it was our ball, it wasn't them making a move.
"If you do those kinds of mistakes, individual errors in front of your own goal, the outcome is going to be defeat."
Information from Press Association was used in this report.