The 23-year-old joined on a free transfer after leaving promoted English Premier League side Brighton Hove and Albion.
He joined Brighton in 2015 from Feyenoord and was loaned to Go Ahead Eagles in the Eredivisie last January.
The controversial attacker had his contract terminated by Dutch side Go Ahead Eagles recently after he openly revealed his support for former club Feyenoord on social media on the day of Eagles' all-important clash with Ajax - a match whose outcome sealed their relegation to the second division.
He is expected to rival South African attacker Tokelo Rantie for the number nine position at the Ankara 19 Mayis Stadium.
Manu, who is a capped Dutch you international remains eligible for the Black Stars and has previously spoken of his desire to earn a call up one day.
He has signed a two-year deal with the Umit Ozat coached outfit.