Crystal Palace are considering moves for two players.
Wan-Bissaka left the club to join United for 50 million dollars.
A loan deal is more likely given the high wages of the right-back.
Palace are also considering a move for the 22-year-old Doucoure, who is a member of the Malian national team.
While Palace are interested in Wan-Bissaka, the new United boss has not yet had the chance to look at the players he wants to keep.
The Eagles will be looking at a new right-back in the summer with Nathaniel Clyne, Nathan Ferguson and Joel Ward all in their thirties.
Palace are hoping to strengthen their center of gravity. Cheikhou Kouyate is out of contract at the end of the season, James McArthur will turn 35 in October, and the loanee will return to his parent club at the end of the season.
Palace has a strategy of targeting younger players who can help improve the side.