United have conceded over 50 Premier League goals in one campaign for the first time in their history, suffering recent defeats to Manchester City and Everton without being able to reply.
David de Gea has been singled out for criticism and when you assess the goals United have conceded recently, it seems pretty hard to argue with the reaction.
The Spaniard dropped a clanger during the Barcelona defeat, conceded a Gylfi Sigurdsson strike at his near post and both of City's goals at Old Trafford were incredibly tame.
However, De Gea certainly hasn't been helped by the defence in front of him and players like Eric Bailly and Marteo Darmian are being linked with a summer exit.
- Klopp answers internet FAQs about him
- Malcom: Messi is 'way above' Ronaldo
- Neymar says he wants to play with Hazard
Struggles for Arsenal and United
If there's any consolation for United, though, it's the fact Arsenal have had similar problems and particularly when it comes to keeping a clean sheet.
Although it's hard to aim similar criticism at Bernd Leno, it wasn't until the recent win at Watford that Arsenal became the last team to collect an away clean sheet this season.
That's not to mention the erratic performances of Shkodran Mustafi, who proved particularly haphazard during the shock home defeat to Crystal Palace.
Clean sheet records
It certainly isn't the type of defensive quality you expect from teams challenging for Champions League football and the clean sheet statistics look particularly dire.
One football fan attracted a lot of attention on Reddit this week after noticing that Cardiff City - despite conceding 65 goals - have held more teams than both Arsenal and United.
Of course, Cardiff have been on the receiving end of far more thrashings, but Neil Etheridge and his defence are clearly more adept at keeping a clean sheet than their superiors.
Bearing that in mind, take a look at the full clean sheets list down below:
Room for improvement
Ok, so Arsenal will be pretty disappointed with tenth, but United should be particularly frustrated to see themselves amongst Southampton and Brighton.
It's a fact that lies at the very heart of United's recent problems and something Ole Gunnar Solskjaer will have to change during his first full season in charge.
The Red Devils simply haven't been prolific enough in front of goal - having now gone over eight hours drawing up a blank in open play - to able to afford conceding so many.
Besides, it's no coincidence that City and Liverpool are the top two in terms of clean sheet and the table as a whole, although Chelsea do interestingly leapfrog Tottenham.
You can also flip the statistic to illustrate how impressive Cardiff have been at times, particularly at home, and any potential relegation won't have been without defensive effort.
Do you think Arsenal or United will reach the top four? Have your say in the comments section below.News Now - Sport News