The 25-year-old, who is currently with the Mexico squad ahead of next month's World Cup in Brazil, has fallen down the pecking order at Old Trafford in recent seasons.
According to 101greatgoals.com, Hernandez told reporters: "My future could be decided tomorrow, a little after, inside three months, I could stay there [in Manchester], I honestly don't know.
"My people are working it out. I'm here [with Mexico] trying to be 100% focused [on the World Cup]."
Hernandez has been a United player for the last four years.