Pochettino said: "I never judge the player when we signed (him). It's always you expect the best. It does not surprise us but of course he is a player that always had the capacity to score goals when he was playing at Manchester City.
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"You were seeing he had the capacity to score easily, no? But in the way he adapts himself in the team and the club.
"The way he is performing, I think it's fantastic. Of course, he is not a top scorer, but he is behaving like a top scorer. He is showing that the club made the right decision finding him."