Yesterday's 1-0 defeat to Chelsea was bitterly disappointing for José Mourinho.
Alvaro Morata's mesmerising header was the only goal in a tense game at Stamford Bridge, and thanks to Manchester City beating Arsenal 3-1 earlier in the afternoon, Manchester United are eight points off their rivals at the top of the Premier League.
The result means it is the third time the Portuguese has taken United to his former club since his appointment, and he has now lost all three without scoring a single goal.
It has also brought more attention to Mourinho's away record at the supposed 'big six' in the league, as he has now failed to win in seven trips to their main rivals, scoring only once in that time.
United have secured just three points from a possible 21 in those matches, and that form is certainly not good enough to bring the title back to Old Trafford for the first time since 2013.
'The Special One' did focus on one positive from their performance in West London though, and that was former scapegoat Marouane Fellaini.
Having been booed by his own supporters last year, the Belgian has been in sparkling form this term, with four goals in nine games in all competitions.
Fellaini damaged his knee ligaments on international duty last month and hasn't played since, only returning to training this week.
Mourinho revealed after the game that the 29-year-old had taken part in just a single training session ahead of the Chelsea match, but was desperate to play and made himself available for selection.
"I thank Fellaini for unbelievable effort," he said.
"He trained only yesterday and made himself available today.
"I have to say Fellaini was fantastic for us, for fans, teams, club.
"He was injured for weeks, trained first time this week but he put himself on the line today.
"I don’t want to let it go without praising him."
Mourinho was clearly bitterly disappointed that the rest of his players couldn't put in the level of commitment that Fellaini showed.
Romelu Lukaku failed to show up in a big game again, and the former Everton man has now gone seven games without a goal, following his £90m transfer in the summer.