The London club had begun the season in good form, winning their first three matches 1-0.
However, they were very poor against Palace at the weekend, only managing two shots and losing 3-0.
Speaking about that game, Nuno said their lack of creativity was a worry, per the Evening Standard: "Training, training, spending as much time as we can on the training ground.
"Preparing the players, trying to find solutions and then give them the support and the confidence to compete and try to improve their performances.
"I don't know any other recipes for success. It's hard work. Hard work and the boys are doing it.
"They are realising that in football there are ups and downs and what's important is how you react to it."
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