The Mali international has caught the eye of the two clubs, with a January switch to the Premier League being suggested
Despite forking out £75 million for Romelu Lukaku in the summer, Manchester United manager Jose Mourinho is reportedly on the hunt for an additional striker in the January transfer window.
Lukaku has been heavily relied upon since his switch to Old Trafford, with only David De Gea (1980) and Nemanja Matic (1944) playing more Premier League minutes than the Belgium international (1814) under Mourinho this season.
"The boy is tired. He is physically a monster but not a machine and he is feeling it," Mourinho said of Lukaku before Manchester United's Premier League fixture against Southampton.