Jackson is interesting Newcastle United and was left out of Friday's preseason friendly against Bayer Leverkusen.
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BBC Sport says Jackson has been told he can leave the club for the right offer.
Fellow attacker Christopher Nkunku also missed the Bayer game and is in the same situation as Jackson with the Frenchman now clear to depart.
Newcastle are set to move for Jackson after top target Benjamin Sesko chose to join Manchester United this week.