Before the celebrations had even subsided at Wembley on Saturday, United's FA Cup win was being overshadowed by fresh reports that Van Gaal was to be replaced by the former Chelsea boss in the coming days.
Van Gaal, who still has a season remaining on his three-year contract, left the training ground around 4.50 pm, waving at those waiting outside the gates.
The victorious United squad boarded their bus just before midday on Sunday with Van Gaal posing for photographs with fans. Have your say in the comments section below.
Ryan Giggs' future at United is up in the air despite Mourinho's wish to keep the Welshman at the club.
By yesterday sources were providing some insight into why it was felt United had to make a change, and not just due to their failure to qualify for next season's Champions League.
League Managers Association lawyer Paul Gilroy QC arrived at Carrington this morning, where he is believed to be discussing the terms of Van Gaal's exit.
Chelsea and Manchester United are set to battle it out for Sporting Lisbon winger Joao Maria, according to reports in Portugal.
However, his failure to secure Champions League football for next season looks to have cost him his job as United focus on three-time Premier League victor Mourinho.
Mourinho's track record is at odds with United's approach adds Sky Sports pundit Jamie Carragher.
Manchester United are expected to announce the end of Louis van Gaal's reign once the sides have agreed to a severance package.
Mourinho has also managed Porto, Inter Milan, and Real Madrid, winning the league title at least once with each club.
They finished with the most 1-0 wins and the joint highest number of goalless draws.
Some of the players would certainly like Mourinho to shake things up a little.
United, without a league title since Sir Alex Ferguson's departure in 2013, see Mourinho as the "winner" they need as they look to revive their fortunes.