Manchester United boss Louis van Gaal feels Robin van Persie is short of confidence.
There are concerns that Van Persie has lost a yard of pace but Van Gaal questioned whether a lack of confidence might also be to blame.
He said: "It's a question also of confidence, maybe a question of scoring a wonderful goal at the right moment.
"You know how strikers are, they have to score goals. They feel like that, it's not that I'm asking that."
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