Per the source, Lions boss Jan Ole Riekerink is a close friend of Hoek and worked with him at Ajax.
Hoek will be replacing Brazilian legend Claudio Taffarel as goalkeeping coach at the Istanbul giants after he recently parted ways after a 10 year stint at the club.
Following Louis van Gaal’s dismissal at United his backroom team of Hoek, Albert Stuivenberg (assistant coach) and Max Reckers (performance analyst) also parted ways with the club.
Hoek released a statement confirming his departure on his official Facebook page.
“I am disappointed to be unable to complete our intended three-year plan,” Hoek wrote via his Facebook page. “But it has been an honour and privilege to coach at such a magnificent club as Manchester United FC.
“At first I thank the players. It was a great please to work with them. And thanks to the owners and board, coaching staff and every member of the club’s staff.
“And last but not least I thank the United supporters who are the best in the world. I wish you all the very best in the future.”
Hoek previously worked alongside van Gaal during his time in charge of Barcelona and Bayern Munich.
The coach was the third to work with United keeper David de Gea in the last three years and will now coach Uruguayan international Fernando Muslera.
Hoek is widely regarded as one of the best goalkeeping coaches in world football.