Rusyn, 26, joined Sunderland two years ago and has made 32 appearances.
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Sunderland sporting director Kristjaan Speakman explained: "At this stage of his career, it's vitally important for Naz to be playing games.
"We have worked hard to identify the right opportunity for him this season, and I know he's looking forward to the challenges ahead."
Rusyn has a deal with Sunderland to 2027.