The Red Devils knew there would be a hole in their forward line if Cavani left in the summer.
Cavani has come up trumps for United several times this season, helping them to second in the Premier League and to the final of the Europa League with 15 goals across all competitions.
The Uruguayan has recently signed a one-year contract extension, and United are excited about what the deal could mean for the club's long-term future.
Not only has Cavani produced on the field, his experience has been invaluable for budding young striker Mason Greenwood.
According to The Mirror, the Red Devils believe they can save £150m by putting their faith in Greenwood as their number nine for years to come.
Both players would cost in the tens of millions, but United hope they can use those funds to bolster other positions.