West Ham United boss Sam Allardyce believes his players can become too cocky.
Allardyce wants to bring a psychologist to West Ham to ease the nerves of his players and stop them "believing their own hype".
"The expectation after that (Palace) game was high and we just didn't live up to it," he said.
"Maybe the players were a bit too cocky. Maybe they had listened to the praise too much. The outside world is not what you should listen to if you want to be successful as a footballer.
"You can be distracted if you get too much praise and perhaps a little put off if you get criticism. They just need to stay focused on their responsibilities."
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