The young forward's future at his current club is in doubt due to a legal dispute, which will likely spark the interest of the Premier League duo, who have watched the player
The 16-year-old signed a new contract with Caen last winter, however, the deal may have to be terminated due to legal reasons.
"In terms of an important document such as an employment contract, the two parents have to sign on behalf of their child under the age of 18," the lawyer of Niang's father Khaldi Ouadi told Le Parisien.
"The father has not signed the contract and he is planning to initiate proceedings to render the contract null and void."
Niang made his breakthrough last season, making seven appearances in the league for Caen and finding the back of the net on three occasions.