The manager believes the January purchase has "made a difference" for the Red Devils and merited his strike against Aston Villa in Saturday's 4-1 victory.
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It was the Spaniard's first for United after agreeing a club-record 37.1 million pound transfer from Chelsea in January and Moyes feels that it had been a long time coming.
"He's deserved it," the Scot told reporters. "His play has been very good. He's made a difference to the team, he's helped the team. Goals were one of the reasons we bought him. He's always scored goals, he's got a very good goal-scoring record.
"I think he was probably feeling it a little bit — he missed a chance in midweek, missed two good chances against West Ham — so I think there have been signs, the opportunities have been coming for him to score goals but, whenever he's played, he's made a difference and done very well for us."