Alexander Isak is training individually at his former club Real Sociedad's training facilities amid uncertainty over his Newcastle future.
It is understood Newcastle are aware of Isak's whereabouts as he recovers from the "minor thigh injury" that the club say has kept him from travelling to Singapore for their pre-season tour.
Isak has informed Newcastle that he wants to explore his options in this transfer window after Liverpool made an informal approach for the striker.
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The former Real Sociedad striker is using the Basque club's facilities with his staff when they are empty for his recovery.
If Isak were to leave Newcastle, his former club would receive 10 per cent of every euro above a €70m (£60.5m) transfer fee.
Sociedad will also get two per cent through FIFA's Solidarity Programme, 0.5 per cent for every season he was with the club.
Isak joined the Spanish club in 2019 from Borussia Dortmund, spending three years with the LaLiga side before joining Newcastle in the summer of 2022 for a club-record £63m fee.
Sky Sports to show 215 live Premier League games from next season
From next season, Sky Sports' Premier League coverage will increase from 128 matches to at least 215 games exclusively live.
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