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United drew 0-0 for the third consecutive game against Crystal Palace last night, with the Red Devils now 14 points behind leaders Manchester City going into this Sunday's derby at the Etihad Stadium.
Having been top of the table at the end of matchweek 18 following a 1-0 win over Burnley, United have won just three out of their next ten in the league.
And it means that after 27 games, United are not any better off under Solskjaer than they were under the two previous managers - as a fan on Reddit has uncovered.
This term United have collated 51 points with a goal difference of +21 and are 14 points off the top.
At this stage in 2017/18, Mourinho's last full season, they had accrued 59 points, a goal difference of +32 and were 16 points adrift of leaders City.
The distance between Mourinho's United and Antonio Conte's Chelsea was the same the year before, with United on 50 points and having a +17 goal difference.
Under Van Gaal, meanwhile, they had less points but were closer to the top. In his first campaign in 2014/15 they collected 50 points and were 13 points behind Chelsea, while a year later they were on 44 points - 12 points off the league leaders.
While there's a case for United being much better to watch under their club legend Solskjaer, there have been no trophies to show for it.
Van Gaal won the FA Cup in 2016 before being sacked two days later, while Mourinho guided the club to his controversial "treble" in 2016/17 when United won the Community Shield, the EFL Cup and the Europa League.
Solskjaer, meanwhile has seen his United side beaten in a slew of semi-finals across the Carabao Cup, Europa League and FA Cup in his tenure.
Reflecting on the drab draw last night, the Norwegian told the BBC. "Of course it's a concern.
"When you have three clean sheets in a row, that will help you win games - but we haven't produced the quality.
"We just have to find a spark again, the quality again and try to win the games."
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