The Mexico international had a scintillating first season in England last term, and has become an important player for United since moving from Guadalajara in July 2010.
A new deal has been in the offing over the last couple of months, as interest from Real Madrid circulates, and the Premier League holders have confirmed that the contract has been signed.
Sir Alex Ferguson was full of praise for the Central American, comparing him to a United hitman of the recent past.
“The last player I remember making an impact as big and as quickly as Javier is Ole Gunnar Solskjaer and he reminds me of Ole a lot,” the Scottish coach told the club’s official website.
“His talent for creating space in the box and his finishing ability mark him out as a natural goalscorer. Off the pitch, he is a pleasure to manage. He works very hard and is a popular member of the squad,” he concluded.
Hernandez could not hide his delight at signing the new deal, and is hoping 2011-12 will be a successful campaign for The Red Devils.
“I never expected my first year to go so well and I’m delighted to commit my future to United.
“To win a title and appear in a Champions League final was fantastic. I’m looking forward to helping my team-mates as we bid to win more trophies for this great club,” the Mexican stated.
Hernandez started on the bench in the 6-1 loss to Manchester City on Sunday, but will be in contention for a starting berth in the club’s next fixture against Everton at Goodison Park.
By Gareth McKnight