Barcelona has scouted the Norway winger extensively. Nusa is expected to leave Club Brugge this summer.
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Nusa is considered a "cheaper" alternative to Nico Williams - who is also being chased by other major clubs.
Nusa, who was close to a move to Brentford in January, has four goals and four assists in 42 competitive appearances this season.
The 19-year-old's contract with the Belgian club runs until the summer of 2027.