Delph struck the winner against Chelsea on Saturday.
"He's been excellent over the course of the 18 months I've been here.
"What sort of player can he develop into? You've seen what he's got, there's massive potential there to be a really top player and if he keeps his feet on the ground, keeps learning, keeps doing what he's doing then we'll see where he goes.
"He's got great energy. Sometimes he wants to hold on to it too long. That will come with more experience, he'll release the ball at the right times."
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