The 27-year-old spent last season on loan at Real Madrid and looks set to make an Old Trafford exit this summer.
His arrival at the Boleyn would add to the Hammers' fairly healthy collection of centre forwards, and here we’ve taken a selection of his league statistics, while at Real Madrid, to compare with West Ham’s main man up top - Diafra Sakho.
|Goals||Assists||Chances Created (per 90 mins)||Take-on Success||Shot Accuracy||Pass Completion||Mins Played|
Sakho finished ahead on goals, with 10 to Hernandez's seven, but had half as many assists - two to four - despite playing almost double the number of minutes as the Manchester United striker.
Sakho also fell short with his shot accuracy and pass completion, recording 42% and 56% respectively, compared with the Mexican's 64% and 82%.
The Hammers striker did have success elsewhere, though, edging it with his take-on success rate - 40% to Hernandez's 33.33% - and in chances created per 90 minutes of game time; 1.18 compared with 1.12 on the part of Hernandez.
Should the reports prove accurate, Hernandez represents great value at £8 million and could be the icing on the cake of West Ham's impressive transfer window.
Sakho impressed last year but falls short of the Mexican in several key areas and has a far inferior goals and assist per minute ratio - surely the best barometer of a striker's contribution?
Doubts persist over how easily a deal could be done, and indeed whether the Manchester United striker would be willing to make the switch to East London.
But If there was ever a time for it to happen, then that time is now, with the Slaven Bilic revolution in full swing and the feel good factor sky high.
In a summer of coups for West Ham, this may just turn out to be the biggest of the lot.