Morrison admitted West Brom failed to maintain the standards which had seen them go five league matches unbeaten and included a win at Manchester United.
"It wasn't as good a recent weeks but there were glimpses of what we were about which we have to build on for next week," he told Albion Player.
"We were well below-par and we got punished.
"A sign of a good team is reacting after a bad defeat and we go into next week a bit wounded but hopefully we can get out of the blocks quicker and put Palace to bed."
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