Diabaté has joined Esteghlal on a two-year contract for an undisclosed fee.
The 31-year-old striker started his playing career in French club Bordeaux and has also played in Ajaccio, Nancy and Metz.
In January 2018, Diabaté joined Serie A side Benevento on loan for the rest of the 2017–18 season.
Diabaté has made 39 caps for Mali national football team and scored 15 goals.