Willian has admitted that he was unable to sleep following Brazil's exit from the Copa America on Saturday evening.
The Selecao were dumped out of the tournament at the quarter-final stage after a penalty shootout defeat to Paraguay.
"Everyone is sad about the defeat," he told reporters. "It was a very long night, I could not sleep. I kept thinking about the game.
"But we must move forward. Now we must lift our heads as there is a lot more to come."
Brazil were also knocked out of the Copa America in the previous tournament by Paraguay.
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