Now Starsport can reveal the fallen giants have promised Mourinho a massive war chest of up to £300m to rebuild the team this summer.
A club source said: "If Jose comes in he will be given whatever it takes to make United the best again.
"But it isn't just about how much is spent, what matters is how it is spent because United need the right players to take the forward. Only genuine world class stars will be looked at."
United are struggling to secure a top four finish this season and executive vice chairman Ed Woodward wants Mourinho to create a side capable of challenging for major trophies - including the Champions League.