The Mexico international and former Chivas Guadalajara man is the first player from his homeland to sign with United and is looking to make the most of this brilliant opportunity.
"It's an honour because I want to achieve big things. It's a very nice challenge and hopefully I will be able to contribute. I will always try to enjoy it because sometimes we focus so much on the achievements and our dreams, and maybe we forget to enjoy it," he said.
"I always try to see pressure in a different way - more like motivation. There are millions of people in the world who would do anything to be in my position and have this opportunity."
Hernandez could make his first appearance in a Red Devils shirt when the club takes on the MLS All-Stars at Houston's Reliant Stadium on Wednesday night.