The Hammers have been linked with moves for numerous strikers so far this close season, but manager Slaven Bilic appears to have settled on Hernandez as his No.1 choice for the lone striker role.
Bilic is hopeful of exercising Hernandez’s £13m release clause and bringing the 29-year-old to the London Stadium as the Hammers boss desperately attempts to bolster his striker options ahead of the 2017/18 season.
Chelsea have also been in the hunt for a player who proved their scourge at times during his five-year spell with United and the Blues are eyeing him up as a cut-price alternative to some of their other targets, which include Pierre-Emerick Aubameyang and Sergio Aguero.
The Mexico international would favour guaranteed first-team football, however, and West Ham would be prepared to build the attack around him, something which is far from assured at Stamford Bridge.
The report adds that senior Hammers officials are plotting more discussions with the Mexican’s advisors though any announcement over a deal is unlikely to be made until at least the back end of this week.
Olivier Giroud and Kelechi Iheanacho were just two strikers linked with moves to the Hammers earlier this summer, but the Arsenal frontman is likely to go to either Borussia Dortmund or Everton if he leaves the Gunners while Iheanacho is seemingly Leicester-bound.
Hernandez’s signing would add to the arrival of Joe Hart, with announcement on a transfer due imminently while the Hammers are also still exploring the possibility of signing Marko Arnautovic from Stoke City.