The centre-forward has had a slow start to his Old Trafford career.
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But Slovan Bratislava's Sporar, 31, told The Sun: “What does he bring to United? Everything. He has speed, power, intelligence, good football IQ.
“I believe he can be a complete striker in the next two or three years.
“But he’s still young. He will help Manchester United a lot, they just need to be patient.
“I believe he’ll score the goals and every year he will be better and better.”
