Chicharito cost the club just £16m from Bayer Leverkusen and many tipped him to become one of the signings of the season, but things simply haven't gone to plan.
The arrival of David Moyes saw Hernandez link back up with his former manager at Old Trafford.
West Ham have had an opening bid of £5 million for Bournemouth midfielder Harry Arter turned down.
Despite making just four appearances for Monchengladbach during his loan spell this season before being recalled by West Ham in the New Year, the 19-year-old is said to have impressed those at the club.
As things stand Hernandez doesn't look likely to improve any time soon as a West Ham player, with Moyes opting to move the rejuvenated Marko Arnautovic into a striking position alongside Carroll or Michail Antonio, meaning even less chance for him to build up any consistency.
Hernandez, who is West Ham's top earner, may be concerned his poor season will impede on his hopes of remaining a regular for Mexico ahead of this summer's World Cup in Russian Federation.