Moyes says the Dutchman has been a pleasure to work with.
Moyes said: "It was a great header, 16 yards on the angle into the side-netting. I've been really impressed with Robin.
"He's been easy to work with. He's been really receptive and helpful.
"We tried to manage him at the right times by playing him for some minutes and not(for others). He's so important we have to look after him at the right times. Today he came up with the goods again with his goals."
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