Martinez believes his midfielder has all the attributes to become an imposing force in the manner of former Germany captain Michael Ballack, who had a stellar club career with Bayer Leverkusen, Bayern Munich and Chelsea.
"I look at Ross and you tell me what weakness he has. He hasn't got one," said Martinez. "He takes in information, which for a young lad is incredible. He can use both feet, he can switch the play, he has a range of passing and can receive the ball in any area.
"He has a great shot and has incredible energy. He reminds me of Michael Ballack. When Ballack was younger, nobody knew what his best position was; could he be a sitting midfielder, an attacking midfielder or play up front? Ross is that impressive."
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