BILD says BVB are in contact with Fernandez's family and have also registered their interest with Barca.
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While the midfield prospect has a deal to 2027, it's understood he is unsettled at La Masia.
Fernandez is still waiting to make a first team debut and is well aware of BVB's attitude towards young players.
A Spain U19 international, Fernandez is a regular with Barca Atletic this season.