The Cameroon goalkeeper joined Trabzonspor on-loan for the season without a permanent option included.
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"I think we understood that this needed a change and sometimes it is hard to point out why," said Amorim on Friday.
"Sometimes it is the moment, the bad luck in some moments.
"It is hard on him, on us. Our thinking is to have a change in the goalkeepers but I wish the best for Andre Onana.
"He was really good at working and trying to help the players, but sometimes you can have all the quality in the world but you need a change."