Antoine Griezmann "knows he can do better", according to Clement Lenglet, who has backed the under-fire striker to turn around his Barcelona career.
Barca forked out €120 million (£109m/$135m) to bring Griezmann to Camp Nou last summer after a lengthy transfer saga, and tied the prolific frontman down to a lucrative five-year contract.
The France international was among the top goalscorers in La Liga season in, season out while on Atletico's books, but has so far been unable to live up to the same high standards in Catalonia.
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Griezmann has only scored eight goals in his first 31 top-flight outings for Barca, having been asked to adapt to an unnatural role on the left-hand side of a front three alongside Luis Suarez and Lionel Messi.