Tipsbladet says City, United and Ajax are all following the 18 year-old.
The Denmark youth international has less than 18 months to run on his contract.
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Scouts have seen him at work in Copenhagen Under 19 matches and in the UEFA Youth League, where Chiakha managed to make a big impression.
The 1.91m tall striker scored eight goals and made two assists in nine matches in the European youth tournament.
In Denmark, the attacker scored sixteen goals for Copenhagen's Under 19s last season.