Cavani had a first start in Saturday's 1-1 draw with Everton.
And opening up on his struggles in recent months, according to El Observador, he said: “In football, you have to always be ready. It's one of the keys at the top level.
"Sometimes you play more, sometimes you play less, managers make decisions, but that doesn't stop the work to always be competitive.
"The league has just started and I have needed to be, not quite like last year, but I'm there to be a part of it."
When asked what he made of Cristiano Ronaldo's arrival, he also added: “Those are things that happen, a lot of debate is created, but football is football and you don't have to turn it around too much, it's not because one or the other is there.
"The important thing is to be prepared for when it's your turn, you always want to play, he wants to be there forever, but that is not going to change my way of thinking or acting."
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