That's according to former Liverpool star Stan Collymore, who's hailed the Red Devils' defensive strength.
Man Utd sit second in the Premier League ahead of Saturday's visit to Anfield having picked up 19 points from their opening seven games.
And although they're the top-flight's second-highest scorers with 21 goals, much of their success has been built upon being solid at the back.
United have kept six clean sheets so far this term and conceded just twice - both goals coming in a 2-2 draw at Stoke.
Collymore says Mourinho has set up his team just as Antonio Conte did during the 2016/17 campaign, when Chelsea finished up as champions.
Writing for the Mirror, Collymore explained: "United boss Jose Mourinho is the arch-pragmatist when it comes to setting up teams.
"He gets his defence right first, then worries about his attack later. It seems to have worked pretty well in the past — and be working pretty well now — for him.
"Antonio Conte did the same at Chelsea last season."
Collymore says Jurgen Klopp has taken a completely different route at his old club, Liverpool, though.
"Whereas at Liverpool it’s the opposite," the ex-forward said.
"Klopp’s front-men now find themselves in a situation whereby they go into games knowing they have to score at least two to stand a chance of even a point.
"The statistics tell us teams which win the league concede between 0.82 and 0.92 goals a game — and already this season Liverpool are at 1.7.
"So there’s not much wiggle-room and until Klopp addresses his back four — and I hope he does so in the January transfer window — his side are going to find it very difficult to keep up with Mourinho and co."
United are seven points clear of Liverpool, who currently sit seventh in the Premier League.
The pair lock horns at Anfield on Saturday in a 12.30pm kick-off.
