The 17 year-old has been linked with a Europe's biggest clubs for the past year, including Manchester United.
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The Daily Mail says Newcastle have had Filling on their radar since last year.
The AIK prospect is high on Newcastle's scouting list, but a deal is difficult to achieve because a transfer cannot take place until he turns 18.
Filling will not come of age until the end of November, which means that a possible move to Newcastle cannot take place until January 2027.
As such, Newcastle's Saudi owners are now considering buying a second European club to help avoid such issues in the future.
