Januzaj made a strong impression in the 2013-14 season, but failed to hold down a first-team place at United and spent the first half of last season on loan at German club Borussia Dortmund, reports Xinhua.
"Adnan will give us a different variation," Sunderland manager David Moyes said on Friday.
"I have to get him back to the level he played at two years ago."
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