Mane registered an assist and scored also the winner in a late Comeback against Aston Villa before scoring in victories over Crystal Palace and Manchester City.
Mane won the award ahead of Son Heung-min, Dele Alli, Raúl Jiménez, Çaglar Söyüncü, Jamie Vardy Lus and Mousset.
This is the third time the Mane has won the player of the Month award, also winning it in August of 2017 and March 2019.
Mane will feature once again this weekend on Saturday when Liverpool face Watford at Anfield.
