The 16 year-old is being tracked by Bayer Leverkusen and Borussia Dortmund, says the Daily Mail.
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Alker is a regular with Leeds U18s this season and an England U17 international.
He won't be eligible to sign pro terms with Leeds until 2027, so opening a path up to Bayer and BVB to tempt him away before then.
Alker also played for England at U15 and U16 level.