Werder Bremen loaned Backhaus, 20, to FC Volendam last season.
Sky Deutschland says Barcelona have been showing interest in the youngster.
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The Spanish giants had scouts on several occasions in recent months take a closer look at the goalkeeper.
Contact has also been made with Backhaus' agents.
Barcelona currently have 32-year-old German Marc-Andr ter Stegen and 25-year-old Spaniard Iaki Pea as their senior keepers.