The Ivory Coast international has moved to Rangers in Scotland on loan until the end of the season.
Diallo has been with United since the summer of 2020, but has only played nine first team games.
Speaking to Rangers' official website, sporting director Ross Wilson said: "Amad and Manchester United had an array of options this window across the Premier League and in Europe, so needless to say, I'm absolutely delighted that we have been able to convince both Manchester United and Amad that Rangers is the perfect place for him to continue to showcase his undoubted and exciting talent."
The talented winger will be hoping to kick-start his career in Scotland, and impress United during his loan spell in the coming months.
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