By ESPNSTAR.com staff
The 24-year-old was a key figure in the club's promotion to Serie A last season making 36 league appearances for the Granata outfit.
His good form earned him a call-up to Italy's Euro 2012 squad and brought him to the attention of Europe's elite clubs.
As a result, United have been monitoring the progress of Ogbonna since the start of the new Serie A season.
"I guarantee there are observers of many foreign clubs who follow our games, including United's scouts," Torino's sporting director Gianluca Petrachi said in The Sun.
"Most of the time they come just to see Ogbonna because he is a player who has great potential.
"Last year we refused £10 million for him but it is clear he is worth more than £16 million.
"Angelo has the desire to do better but I believe he should continue to grow with Torino."
Ogbonna is under contract with Toro until June 2016.