Manchester United are reportedly interested in signing Borussia Dortmund midfielder Axel Witsel.
Witsel spent the 2017-18 campaign with Chinese outfit Tianjin Quanjian before returning to the European game during the summer, and he has a contract with Dortmund until 2022.
According to ESPN, Witsel's impressive form for Dortmund this season has attracted the interest of United, whose head coach Mourinho is a long-term admirer.
The report adds that United are unlikely to make a move in the January transfer window but could launch a bid at the end of the season.
Witsel has scored three times in 18 appearances for Dortmund this season.