The Red Devils are in an alarming state of affairs, having lost their last three games in a row.
Defeat to Watford over the weekend saw United succumb to a third straight loss in all competitions, after starting the season brightly with three wins from their first three games.
This has sent alarm bells ringing surrounding the Red Devils, who have been tipped to challenge for the Premier League title this year.
Dugarry, once of Barcelona and Birmingham City, spoke on his RMC radio show about the appointment of Mourinho, before questioning the manner of his success over the years before taking the managerial hot seat at Old Trafford.
'I get the feeling Mourinho's last tactical success was that Champions League game between Inter Milan and Barcelona," the 1998 World Cup winner said.
'He's won titles since, but I think he's lost the plot. He believes he has become more important than the team.
'Tactically, I think he doesn't put anything in place. Apart from the players, who have changed, it's the same organisation as last season under [Louis] Van Gaal.
'He always blames the referee or their opponents' good fortune. There is no self-criticism.'
Mourinho's tactics certainly seem to have been unravelled in recent weeks, particularly in the 3-1 defeat to Watford where they were undone by the home side's energetic attacking play.
At such an early stage of the season, the club lie six points behind bitter rivals Manchester City at the top of the table and, while talk of a crisis at Old Trafford may be premature so early in the campaign, United do have work to do to arrest what is a concerning run of form for Mourinho and his players.
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