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Rumours have surfaced this week that the Portuguese is unhappy at the club and there are fears he could walk at the end of the season.
The former Chelsea boss is desperate to hunt down rivals Manchester City at the top of the Premier League and he requires January reinforcements to do so.
According to The Sun, Mourinho wants £80m to spend this month but chief executive Ed Woodward is reluctant to hand over the cash.
And the club’s hierarchy are set for clear the air talks with the manager, who’s requested he has more of a say in future transfers.
Jose Mourinho looks downbeat returning to Lowry Hotel after Man Utd training
Eamonn and James Clarke
“United are currently second in the Premier League and trail their table-topping neighbours by 15 points.”
Mourinho has been linked with a sensational move for Real Madrid star Gareth Bale and has promised to extend his stay until 2021 if his demands are met.
The Sun claim that he has a long wish list of players, including Danny Rose, Ryan Sessegnon and Thomas Lemar.
And he’s also keen to sign Brazilian duo Fabinho and Malcolm, as well as Celtic defender Kieran Tierney.
However the United board are concerned that City are too far ahead already and would rather save the money until the summer, with transfer fees generally inflated in the January window.
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United are currently second in the Premier League and trail their table-topping neighbours by 15 points.
They return to action a week on Monday as they host managerless Stoke.