While Cristiano Ronaldo has weighed in with 27 goals this season, the England striker has had to settle for 10 and Ferguson believes Rooney might have been trying too hard in the midweek victory against Portsmouth which could have cost him a chance to add to his tally.
"It is a joy to see someone of his age play with so much enthusiasm," said Ferguson. "He just needs to control his energy - he will soon be banging in the goals again."
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