Barcelona coach Tata Martino insists he has no concerns about Lionel Messi's form.

Messi has struggled for goals in recent weeks.

"All this about Messi has come about because we never see him go four games without scoring. We ask far too much of him, and when he goes four games without scoring we forget the assist he gave to Cesc against Celta or the goal against Milan. He doesn't seem worried to me," insisted Martino.

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