Mangala was one of the key figures in guiding Stuttgart back to the Bundesliga and is a highly rated talent.
With good dribbling and precise passing, Mangala has impressed Atalanta boss Gian Piero Gasperini.
Mangala has a double-digit (€10m-plus) valuation and Atalanta are said to be ‘very interested’ in him.
He made 29 appearances in the latest 2. Bundesliga season, scoring once and providing three assists.