He only played like 14 minutes for Portugal.
I think you can spot quality pretty fast. Just like the difference between Deulofeu and Dembele when he first joined. They looked miles apart when Dembele made his first few steps here - took like 5 minutes to see. Same as Konrad compared to Trincao in the preseason frindlies, even when the former had his moments.
But there are no guarantees - see Dembele.