Manchester United boss Louis van Gaal says Ander Herrera "must improve".
The midfielder has struggled for a start under LVG.
Van Gaal said: "I have to compare him with people like [Wayne] Rooney and [Juan] Mata, for example, so that's difficult. They all have a high level - he has to improve.
"He's a great guy, he's a very great professional also, so that's not the problem."
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