The 18 year-old was a wanted man over the summer, with Chelsea, Everton Real Betis and Roma all interested.
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Al-Nassr have also expressed interest and while the Saudi market window is now shut, Mundo Deportivo says they're set to make a move for the teen in January.
Bernal's contract expires at the end of the season, though the deal carries a three-year option on Barca's side.
The midfielder has just recovered from long-term injury and is set to play a part in Barca's plans this first-half of the season.