Hernandez arrived at United last summer as a virtual unknown, but finished the season as a new Old Trafford hero after a brilliant debut campaign.
His stunning integration into English football eventually saw him relegate Premier League joint-top scorer Dimitar Berbatov to a reserve role, as he striked up an impressive partnership with Rooney, with both of them combining for 36 goals in all competition.
However, Hernandez picked up concussion while on tour in America with United earlier in the summer, which delayed his start to the season.
Young striker Danny Welbeck has done considerably well for United in his absence, but after the England international picked up a hamstring injury in their last game against Arsenal, Hernandez will be looking to make his first start of the season this Saturday against Bolton.
And ahead of a possible reunion up front with Hernandez, Rooney has paid tribute to his young strike partner.
"He was a young lad in his first season and I probably didn't think he was going to play as many games as he did," Rooney told MUTV.
"Once he got into the team, he took his chance and the manager kept him in. He repaid the manager with goals and was brilliant for us last season - a big reason why we won the league.
"I'm looking forward to him doing the same, if not scoring more goals for us, this season."
Rooney also played down suggestions that Hernandez would find scoring more difficult this season as opposition defences become more aware of his abilities.
"Of course people know about him now, but if you look at all the top players around the world, people know how they play and it's still difficult to stop them.
"I'm sure people will know a bit more about him this year, but his movement is so good, it's difficult to defend against.
"It won't be easy for players to defend against him whether they know about him or not."
Furthermore, Rooney reveals how their partnership has also transcended onto the training ground, where they regularly spur each other to do better.
"He's a lovely lad who is great for us around the dressing room. Me and him do a lot of finishing after sessions to try and keep progressing and getting better.
"It's great to have a lad who has just come into the team, who speaks good English and is always smiling. It's great for him and for me to have someone like that.
"I think we can both learn from each other."