Mexico coach Miguel Herrera has said that Javier Hernandez is frustrated at Manchester United because David Moyes has not given him enough starting opportunities.
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Hernandez, 25, has struck seven times this season but has only began 10 games, while Moyes has only picked him in his first XI in the Premier League four times.
And with the United manager preferring Robin van Persie, Wayne Rooney and Danny Welbeck in attack, Herrera insists the Mexico international is starting to get irritated by the situation.
He told Raza Deportiva: "He seemed well but he is a bit frustrated because he doesn't play, despite training well. And the truth is that when he does play, he makes a huge effort on the pitch.
"He is a bit frustrated because the current manager doesn't give him many chances, but he is committed and doing what he can to become a starter."
Hernandez, who was a substitute in United’s 2-2 draw with Fulham on Sunday, provoked speculation about his future after the game with a cryptic post on Instagram.
He wrote: "The time to speak about so many things will come…"
However, Hernandez later added another post suggesting that he had meant no harm to United first time around, writing: "Always grateful."
In January, the striker's agent and father, Eduardo, told ESPN Deportes that Hernandez is wanted by six clubs in Spain, Italy, France and Germany, including "one of the top 10 teams in the world."