United claimed a 2-0 win over Ajax in the final of the Europa League on Wednesday.
That result saw the Red Devils secure Champions League for next season.
And, according to the Daily Mail, Mourinho will seriously bolster his squad ahead of a return to Europe’s premier club competition.
They claim the Portuguese is likely to make four signings this summer, apparently parting with a cool £300m in the process.
Antoine Griezmann, Romelu Lukaku and Andrea Belotti are all said to be on his list of attacking targets.
Everton are reportedly demanding £100m for Lukaku while Griezmann and Belotti both apparently have release clauses approaching £90m in their respective Atletico Madrid and Torino contracts.
Meanwhile the Daily Mail claim United could spend a further £30m to re-sign defender Michael Keane from Burnley.
"Ed Woodward has my list," said Mourinho after the win in Stockholm.
"Now it's up to him and the owners."
