The midfielder moves to Minnesota for an undisclosed fee.
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Sunderland chief Kristjaan Speakman said: “Nectar’s experienced regular first-team football throughout the past 18 months and improved significantly.
"He understands the value of continuing to play regularly at a senior level, and in Minnesota United, he’s joining an interesting project in a new country.
"Now, it’s up to Nectar to once again take the opportunity ahead of him and progress, and we all wish him well in the next chapter of his career.”