Manchester City goalkeeper Ederson insists he remains exhausted after games - even if they dominate possession.
For a 15-minute spell during the second half of Sunday's derby win over Manchster United, City had 92% possession.
"It is difficult to concentrate when I don't see much of the ball," said the Brazilian goalkeeper.
"I constantly communicate with team-mates. Even in a game when I don't make many saves, I am tired mentally - the mental tiredness is more tiring than physical!
"You need to be prepared for everything when there is a counter-attack."
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