Now on-loan at Real Betis, Antony has been outstanding in the first weeks of his stay in Spain.
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Amorim said in response on Friday: "I don't know, sometimes it is, it can happen at any club.
"There is a lot of pressure at this club and you have to have a strong core in your team to help younger and talented players from abroad.
"If you play better as a team and have a strong core, as befits this club, it will be easier for these players (such as Antony) to play well."