Wan-Bissaka left for United for £50 million in 2019, but has failed to hit the expected heights.
While he was in solid form early in his United career, he has endured a miserable campaign in 2021-2022.
According to the BBC, Palace are seriously considering bringing him back to Selhurst Park in the summer.
Given Wan-Bissaka's wages, a loan move seems the most likely, but a direct sale is not ruled out.
Much will depend on whether incoming Man United coach Erik ten Hag plans to use Wan-Bissaka next season.