Manchester United striker Javier Hernandez has hit back at critics who have claimed that he has struggled in the Premier League this season.

Hernandez, 23, was one of the stars of the 2010/11 campaign with 20 goals for United, but he has found the going a little tougher this time around.

The Mexican, who has nine goals this season, has admitted however that he is "happy" with his current form.

"In my mind I've only got one aim and that is to always improve. Maybe people have their opinion of me and how I am doing this season," Hernandez told The People.

"The second term at a new club can always be tough but while I am still scoring, I am happy."

Hernandez will hope to be in action when United face Ajax in their Europa League tie on Thursday evening.