The former Tottenham man was on the scoresheet for victory at Fulham.
"It's hard to believe Steven is only 21," said Turner.
"He has a lot of Premier League experience and, for me, doesn't have any weaknesses.
"A lot of his players at his age are loaned out to lower league clubs to learn their craft.
"But he's doing that in Premier League football and doing a fantastic job.
"We faced a big challenge against Berbatov and Bent, they are quality players and very different from each other."
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