The 22-year-old is set to link up with former United coach Kieran McKenna at Portman Road, with the latter leading the Suffolk side to automatic promotion from League One last season and starting superbly this time around.
Brandon made five appearances for the Reds across pre-season this summer and will bring a wealth of Championship experience with him, having spent the 2021/22 campaign on loan with Town's local rivals Norwich City.
Having appeared 51 times for United since his debut back in September 2019, he made his bow in the Premier League under Ole Gunnar Solskjaer a month later at Old Trafford, against Liverpool.