The Daily Star reports that the Anderlecht wonderkid is being tracked by both Manchester clubs ahead of the January transfer window.
United have reportedly been keeping tabs on the 18-year-old for more than a year.
Tielemans is already and Belgia Under 21 international and is the youngster Belgian ever to play in the Champions League.
United and City face competition from the likes of Chelsea, Barcelona and Borussia Dortmund in the battle for Tielemans.
