Roberto De Zerbi said Albion were not right mentally as they were routed by Everton.
The counter-attacking Toffees plundered a 5-1 win at the Amex.
The result followed Albion's dramatic win over Manchester United on Thursday.
De Zerbi is keen for his side to reach Europe but says that entails reeling off performance after performance.
He flt Albion did not do that today.
The Seagulls head coach said: "In the first half we showed we are not ready yet to compete, to achieve the big target.
"I am speaking about mentality, not other things.
"Not other parts of football.
"It is not easy because playing three games in a week is difficult if you are not used to playing so many games.
"But, if we want to improve, if we want to fix our target higher, we have to improve very fast.
"I think we didn’t forget the victory against Man United.
"The biggest quality of the big teams is to forget when you win.
"You have to be ready to play every game, every day.
"Today we arrived at the stadium late – the second half."
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