Charlie Austin scored the only goal of the game for the Saints on his Premier League debut.
According to Goal.com, United cancelled their routine post-match warm-down session following the defeat as the mood at the club is at its lowest ebb.
The day after every fixture, United players visit the Carrington training ground for a 45-90 minute run and the same was expected on Sunday (24 Janaury) but training was cancelled.
Meanwhile, Daily Mail reports executive vice-chairman Ed Woodward has held individual meetings with senior players to get their views on Van Gaal with the general consensus being that the 64-year-old manager should be sacked to make way for Ryan Giggs until the end of the season.
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