The Mexican was injured following a late challenge by Ashley Cole in Sunday's 3-1 defeat of Chelsea.
United boss Sir Alex Ferguson's immediate reaction was to rule Hernandez out for two weeks but there were fears the striker could be sidelined for much longer.
Late tackle: Fergie feared the Mexico international would be sidelined for two weeks
However, after sending the ?7million buy for scans on Monday, his agent said Hernandez has suffered nothing worse than a 'bump' and the player will be back in training after tonight's Carling Cup trip to Leeds.
'Nothing, it's just a bump, nothing more,' said Eduardo Hernandez.
'It looked like (his absence) was longer, they were looking for a fracture, that's why they ran those tests on him.
Flat out: But Hernandez will return to training on Wednesday
'I expect him to be training without incident on Wednesday.'
The FA confirmed on Monday that, Cole, who was booked for the tackle, will not face further action.
In the book: Cole escaped with a caution from Phil Dowd
With fears of a long absence allayed, record signing Dimitar Berbatov is now expected to make his first start of the season at Elland Road.
Pain game: Hernandez is set to return sooner than expected for United
The Bulgarian secured a share of the Premier League's Golden Boot with Carlos Tevez last term but, thus far, has been restricted to just two substitute appearances, the latest as Hernandez's replacement at the weekend.
Sweet FA: Cole off the hook over horror Hernandez tackle despite Fergie's red plea Owen: I have no regrets over my bit-part role at Manchester UnitedCARLING CUP LIVE: Follow all the action as it happens from the third roundEXCLUSIVE: Glazers pay out record bonus to United staff at Old Trafford