The former Manchester United forward only joined the Hammers from Bayer Leverkusen in the summer, but reports in Mexico claimed the 29-year-old was looking to secure a move back to his first club Chivas Guadalajara.
However, in a post on his official Twitter page, Hernandez dispelled suggestions he was unhappy with life at West Ham, who have replaced manager Slaven Bilic with David Moyes.
"The news is completely false. I'm 100percent committed to improve the situation we are in at West Ham," Hernandez said. "As I've always said, I'm a Chivas supporter at heart but I have absolutely never requested to leave West Ham."
Hernandez has scored four goals for West Ham this season, and is expected to be given a chance by Moyes, his former manager at United.
Moyes inherits a side who sit third bottom of the Premier League, and will take charge of his first match away at Watford on Sunday, with Hernandez likely to start.