The Brazil international has adjusted to a new wing-back role under Amorim since the Portuguese's arrival.
The manager told talkSPORT after victory at Manchester City: "I think, when we started, everybody is from scratch.
"We took like one month to explain that everything has a new beginning because every person deserves a new beginning and the power is in their hands because, if they show it, I will put them in to play.
"I just want to win. They are responsible to play, not me.
"He did a great job improving in that position. He has to defend more but he has the ability to do it and has to do it himself."
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