Signed from Mexican club Chivas for £6million just before making a big impact on the World Cup in South Africa, Hernandez has the same livewire speed and eye for goal as the 'Baby Faced Assassin'.
Solskjaer, now in charge of United's reserve team, said: "You can see a player who is hungry.
"He's a great mover off the ball, his physique is sharp, he's clever with his runs and his finishing is good.
"Since the World Cup, he's probably not had a proper rest but his mind will have been on making a good first impression.
"He has managed that, on and off the pitch.
"He threatens the space behind defenders and that's the worst thing for defenders to face - players who know when to run, know how to time their run and always think about scoring goals."