A host of Premier League clubs have been tracking Red Bull Salzburg attacker Mane for some time, but West Ham are hoping to pull a coup by luring him to Upton Park.
Mane has been a revelation at Salzburg since joining from Metz in 2012 and his performances for club and country have established himself as one of the best young talents around.
The 22-year-old, who can play out wide or up front, has scored 42 goals in 79 appearances for Salzburg and also contributed 28 assists for the Austrian champions.
Mane has also impressed at international level, scoring four goals in 15 appearances and he also represented his country at the 2012 Olympics in London.
Salzburg are bracing themselves for offers for their prize asset and it is understood the club have promised Mane they will let him leave this summer for the right offer.
Mane is thought to be keen to try his luck in England and the pacey and powerful attacker would fit the bill for West Ham as they look to bolster their attacking options next season.