The former Borussia Dortmund man started in and finished the team's 1-0 defeat against West Ham in the Carabao Cup at Old Trafford.
An early goal from Manuel Lanzini secured victory for the visitors, with United producing few moments of real quality throughout the match.
Ole Gunnar Solskjaer made wholesale changes to his team, but a lot more was expected from the likes of Sancho, Anthony Martial and Jesse Lingard.
Sancho is yet to score or assist a goal for the Red Devils, which is something that needs to change sooner rather than later.
The 21-year-old has really struggled in Premier League action for United and is currently the eighth-lowest rated footballer in the division so far this season on WhoScored.
Manchester United 0-1 West Ham | Chelsea 1-1 Aston Villa | Carabao Cup | Football Terrace
That's pretty damning for a man who cost upwards of £70 million this summer...
Below, we've provided the 30 players with the lowest ratings in the 2021/22 Premier League campaign thus far and Sancho is far from the only big-name on the list.
(In case you were wondering, only players to have featured in three or more games are handed an overall rating on WhoScored.)
30th - Jamaal Lascelles (Newcastle) - 6.25
29th - Anthony Martial (Manchester United) - 6.25
28th - Ciaran Clark (Newcastle) - 6.24
27th - Nuno Tavares (Arsenal) - 6.23
26th - Jamie Shackleton (Leeds) - 6.22
25th - Milot Rashica (Norwich) - 6.21
24th - Tyler Roberts (Leeds) 6.18
23rd - Ibrahima Diallo (Southampton) - 6.16
22nd - Giovani Lo Celso (Tottenham) - 6.16
21st - Isaac Hayden (Newcastle) - 6.15
20th - Jakub Moder (Brighton) - 6.15
19th - Granit Xhaka (Arsenal) - 6.15
18th - Kelechi Iheanacho (Leicester) - 6.14
17th - Matt Targett (Aston Villa) - 6.14
16th - Joshua Sargent (Norwich) - 6.14
15th - Lukas Rupp (Norwich) - 6.14
14th - Junior Firpo (Leeds) - 6.13
13th - Ken Sema (Watford) - 6.13
12th - Adam Idah (Norwich) - 6.11
11th - Enock Mwepu (Brighton) - 6.10
10th - Andre Gomes (Everton) - 6.09
9th - Andriy Yarmolenko (West Ham) - 6.09
8th - Jadon Sancho (Manchester United) - 6.07
7th - Fabio Silva (Wolves) - 6.05
6th - Ryan Fraser (Newcastle) - 6.02
5th - Matej Vydra (Burnley) - 6.01
4th - Tim Krul (Norwich) - 5.98
3rd - Shandon Baptiste (Brentford) - 5.84
2nd - Freddie Woodman (Newcastle) - 5.81
1st - Cedric Soares (Arsenal) - 5.74
Sancho's rating is just a touch above 6.00 overall and that's simply not good enough for a footballer with his undeniable quality.
Arsenal right-back Cedric is comfortably the lowest-rated player in the Premier League so far this season, something that isn't too surprising given the Portuguese's woeful display in the 5-0 defeat to Manchester City.
No wonder Mikel Arteta was so desperate to sign Takehiro Tomiyasu...