The Mexico international striker's national-team boss says that he has been vexed by David Moyes's reluctance to allow him more opportunities but remains determined to do well
The striker has made 27 appearances in all competitions for United this season but only 10 have been from the start, with the 25-year-old having only begun four Premier League games.
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Herrera recently spoke to Chicharito during a tour to meet with Mexico's European-based players and 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.
"He likes to work and likes to show determination to achieve his goal."
Since Herrera took over as Mexico coach in October, he has only picked Chicharito once in four matches.