The Old Trafford boss spoke with members of the Glazer family following Sunday's miserable 1-0 home defeat to rock-bottom side West Bromwich Albion, which finally confirmed the Premier League title for neighbours Manchester City.
Mourinho was quick to state his squad would be improved and has already held a series of meetings in recent weeks with United's executive vice-chairman Ed Woodward.
United's co-chairman Avram Glazer was in the directors' box for the visit of the Baggies and it was a prelude to Mourinho firming up his transfer requirements to the wider ownership.
It is understood the Portuguese tactician wants two new full-backs on each side, a central defender and two central midfielders, which will almost certainly cost a significant amount.
The Glazers have backed Mourinho to the tune of £300m during his two seasons at the club but the shock defeat to Albion may even have strengthened his hand further when it comes to highlighting the current deficiencies in the United squad.