The striker enjoyed a 10-minute run-out in the 3-0 win over Spurs last Monday, his first action for the Reds since May’s Champions League final defeat to Barcelona.
Chicharito was given a month off after playing for Mexico in the Gold Cup in June, but then proceeded to miss all of the Reds’ pre-season and the opening league game against West Brom after suffering concussion on tour in the USA.
The 23-year-old admits he was impatient to be out for so long, but is now ready, if selected by Sir Alex, to take on the Gunners at Old Trafford on Sunday.
"It was great to play again, unbelievable," Chicharito told MUTV.
"I had one month off after the Gold Cup, and then the thing happened with my head, so it was two months without games.
"That was difficult but I talked to my family and friends every day when I was out, and made sure I was ready.
"Thankfully, for the last game against Spurs I was on the bench, then I played 10 minutes and I enjoyed it a lot."
Chicharito was a revelation in his maiden campaign, scoring 20 goals in all competitions, including four in the Champions League.
Like everyone of a Red persuasion, he was bitterly disappointed to lose to Barcelona and is hoping to go one better this term.