Sport says Barcelona jave followed the 20-year-old's progress this season.
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Barça are in the market to strengthen the attacking options of coach Hansi Flick's attack, with Gittens on their radar.
The England U21 winger has a contract that extends until the summer of 2028 with BVB.
Still only 20, Gittens has so far scored 16 goals and provided 14 assists in 91 matches for Dortmund.