Manchester United boss David Moyes has long admired imminent signing Juan Mata.
Moyes talked up the departing Chelsea star when in charge of Everton almost three years ago.
"They have added a couple of new dimensions to the way they play and, for me, Juan Mata is the biggest difference I see in Chelsea," he said.
"Mata is probably as close to David Silva as I have seen. He has given them a flexibility that they had in their heyday."
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