The Fanatik newspaper report that Nani included an option in his contract giving clubs from England, Spain and Italy a minimum fee release clause of €8 million.
The option is not available for clubs outside the three countries mentioned above which explains how Fenerbahce were able to turn down a €20 million bid from China over the winter transfer window.
Nani joined the Yellow Canaries on a three-year deal from United and has hit the ground running at his new club scoring 10 goals and providing eight assists in all competitions for the Istanbul giants this season.
The Portuguese international is currently rated the second best performing – statistically – player in the Turkish Super League according to Whoscored.
Despite being linked with a number of clubs Nani is reported to be happy in Istanbul having settled into life in Turkey.