La Real management do not see the Nigeria international in their plans for next season and have circulated his name across Europe.
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Sadiq spent part of last season on-loan with Valencia, where he scored six goals in 19 games.
Sadiq has been transfer-listed for €10m by La Real and Estadio Deportivo says interest is arriving from Turkey.
Samsunspor, Besiktas and Trabzonspor are all in contact for the centre-forward, 28.