The Brazilian duo are in action on Friday evening against Uruguay, with their World Cup qualifier set to kick-off at 1:30am BST.
"I believe that match against Watford will be very hard for us, I don't think we will play. Neither Alisson or myself," he told Sky Sports.
"The match against Uruguay will be Friday overnight here (in the UK) and the match against Watford will be at half past noon.
"With all of what is involved, including travel, I don't know how much time we will have between one game and the other."
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