Büttner made only his seventh start this season for Manchester United - and his first in the league since September - so had a close-up view of Rooney's spectacular long-range lob.
"He scores a lot of goals like that in training," the Dutch defender said. "He scores unbelievable goals all the time, not just in matches. Still, even though you know he's capable of it you don't expect what we saw [at West Ham]. It was brilliant unbelievable."
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