Speaking after Portugal’s goalless draw with Austria the experienced winger was quoted by Fotospor as saying: “You won’t be able to get a word out of me yet.”
United who are reported to have already agreed personal terms with Nani according to Turkish media outlet DHA.
Nani left United last summer joining Fenerbahce on a three-year deal but is reported to have fallen out with current head coach Vitor Pereira.
The 29-year-old did however, have an impressive debut season scoring 12 goals and providing 13 assists for the Super Lig runners-up.
Nani has also been targeted by fellow Premier League outfit Everton while Italian giants Inter and La Liga side Valencia are also reported to be interested.
The Portuguese international has an €8 million release clause which is open to clubs from the Serie A, La Liga and Premier League.
Nani starred in the draw against Austria and already has one goal in Euro 2016. The Portuguese winger is expected to start in the final Group F games against Hungary.