The Mexican forward, who has completed his first full pre-season with the Old Trafford club in three years says he is ready to give his all whenever Sir Alex Ferguson needs him
The striker was not considered for Mexcio's Olympic football squad this year, which gave him a rare break during the summer months - having played in World Cup 2010 and Gold Cup 2011 in successive years.
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"My first season [2010-11] was very good for some people and for some people it was okay," Chicharito told reporters.
"My second season was okay for some people and very bad for others. Me? I'm happy and I'm enjoying my football. I just hope that the break this summer helps a lot.
"I had a proper rest and played my first pre-season with the team, so it's going to help my fitness. I'm the happiest player in the world to play for this club.
"I'm always ready if the boss asks me to start or be on the bench. I'm focused on the most important thing - the game tomorrow. I'm looking forward to it."
Chicharito is expected to feature in the Red Devils' first Champions League game of this season against Turkish side Galatasaray on Wednesday.