Masuaku has joined Sunderland as a free agent after coming off contract at Besiktas.
The 31 year-old has signed a two-year contract with the Black Cats.
"I'm excited to be here and I'm also really happy to be back in the Premier League," Masuaku said.
"I want to bring a winning mentality and joy to the fans, and I'm excited to get started."
Sunderland football chief Kristjaan Speakman added: “Arthur’s a player with considerable Premier League experience and a different profile to enhance our squad. He’s a well-rounded full back who is strong in possession and not only impacts defensively, but also in the final third.
"He is eager to share his knowledge and experiences with the group, and this benefits the environment we are continuing to build. We are delighted to have secured him, and we will get to work immediately to integrate him into our squad, so he can make a positive impact as quickly as possible.”