United slipped to their ninth defeat in 17 games so far this season, with the Dutch manager failing to deal with a host of injuries and exiled players.
Ten Hag may have thought he had eased some of the pressure with a last-gasp 1-0 win against Fulham last weekend but any brief reprieve was halted after their 4-3 defeat to Copenhagen in the Champions League.
Having gone two goals ahead after a brace from Rasmus Hojlund, United found themselves on the back foot after Marcus Rashford’s red cards.
They were level at the break and, despite edging ahead courtesy of Bruno Fernandes’s penalty, eventually succumbed to a 4-3 defeat after two late goals from the Danish side.
And now, it has emerged that several players in the squad were left unhappy with some of the team selections, according to a report by i.
In particular, the decision to start 35-year-old Evans instead of four-time Champions League winner Varane in central defence has raised eyebrows.
Varane was ultimately introduced after just 15 minutes when the Northern Irishman went down with injury but struggled alongside Harry Maguire for the rest of the game.
In addition, the late decision to bring on Mason Mount for Hojlund up front – which attracted criticism from commentator Robbie Savage – caught players by surprise too.
The dressing room is still said to be in favour of the 53-year-old continuing, and there is no indication from the club that his job is under threat.
However, it does once again ramp up the pressure around Old Trafford, with the Red Devils eighth in the league and bottom of their Champions League group.
United host Luton Town this weekend before the international break as they look to pick up just their second win in their last five games.