The 33-year-old was on the brink of an Old Trafford switch in the summer, but it collapsed over his salary.
But Mandzukic wants to move to United, and will now take around £150,000-a-week to make that happen.
The Croatian ace also has offers from Qatar, which he is happy to reject in favour of the Premier League.
An Old Trafford source said: “His reps have been in contact and are willing to change their demands.
"There will be other bonuses factored into the deal. It looks like one that could get done now.
"Ole has long been an admirer of him and he is someone we have wanted for a number of years.
"His experience could prove vital for the younger players in the squad. He is also a proven goalscorer."