The Liverpool striker goes into the World Cup opener with Italy in excellent goalscoring touch.
"He has turned into a top, top striker and it's great to see," Rooney said of Sturridge. "Brendan Rodgers deserves a lot of credit for his progress.
"He went to Liverpool and played almost every game. His goalscoring record is incredible. He's unpredictable, and that makes him hard to mark for defenders. He's a big player for us. That's a quality of his."
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