Speaking to the club media, Altay Bayindir said: "It is a huge honour to join Manchester United and become the first Turkish player to represent this incredible club.
"I have a passion for success, and I will give everything to help this special group of players to achieve our ambitions.
"I cannot wait to start working with such an experienced goalkeeping unit. We will support each other and drive high standards every day so that each of us is ready to perform whenever called upon."
Bayindir's transfer to Man United was officially announced on Friday with the Turkish goalkeeper joining from Besiktas for a fee of £4.3 million.
The 25-year-old goalkeeper is set to provide cover for Andre Onana and will have a chance to impress in cup competitions over the course of the season.
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