The young Belgian goalkeeper has kept two cleans sheets in his first two games for United.
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Ahead of today's clash with Brighton, Amorim said: "I think a little bit because it's hard in the moment of our club, all the speculation around the goalkeepers, he's not a young kid but he's still young.
"He coped really well with the pressure, he's really composed, he's defending really well.
"The importance of playing with both feet to kick the ball is so important nowadays, especially when you have to play against Liverpool in a more direct style. I'm a little bit surprised, but I was expecting a talented guy. But yes, a little bit surprised."