The big money signing from only a few years ago is no longer in the plans of coach Erik ten Hag.
According to The Telegraph, United will allow Wan-Bissaka rejoin Crystal Palace for £10 million.
That would mean taking a £40 million loss on a player they secured three years ago.
Wan-Bissaka was abject for most of last term for United under both Ole Gunnar Solskjaer and Ralf Rangnick.
His place in the side has been taken by Diogo Dalot, who has not impressed either.