Hernandez signed for West Ham from Bundesliga side Bayer Leverkusen back in the summer for a fee of £16million.
Big things were expected of the Mexican, who excelled over in Germany and who previously enjoyed a successful stint at Manchester United.
However, start to life at the London Stadium has been tough with the 29-year-old managing to find the net just three times as the Hammers have toiled under Slaven Bilic.
And Spanish website Don Balon claim Hernandez already wants to leave West Ham, despite being relatively happy in the capital.
They pinpoint his relationship with Spanish actress Andrea Duro as the reason why.
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Duro is supposedly aware that his decision to leave United for Leverkusen in 2015 spelled doom for a past relationship with Lucia Villalon.
Hernandez reportedly does not want to see his relationship with his current partner end and is now mulling over a move to Spain in order to be closer to her.
Don Balon add that the Mexican has two destinations in mind.
Sevilla and Valencia are the two teams of his liking, and he has instructed his agent to try and broker a move in January.
Both teams, however, are flying in La Liga and whether they make a move for him remains to be seen.
Sevilla sit second in the table, winning five of their first seven games.
And Valencia are third, six points off the summit.