United, who have not lifted the Premier League trophy since 2013, finished 19 points adrift of Pep Guardiola's champions last season.
Mesut Ozil of Arsenal celebrates after he scores his sides first goal during the Premier League match between Arsenal FC and Leicester City at Emirates Stadium on October 22, 2018 in London, United Kingdom.
The Gunners extended their unbeaten to 20 matches after their victory over Spurs and a 2-2 draw with United on Wednesday evening.
United have played just 15 ahead of Saturday's clash with Fulham at Old Trafford. The Frenchman took part in an under-23 game for Arsenal, but Emery suggested in his pre-match press conference that the defender might play against Qarabag in the Europa League in the coming week.
Manchester United have held talks with an agent regarding their transfer plans going forward, journalist Andy Mitten has revealed.
"I need to adapt considering the team I'm now playing in, the coach and the league I am playing in".
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"I don't need to listen to what goes around and when people say "we're nice guys and maybe we have some ideas about football".
Asked on Friday when United, now eighth in the Premier League, will challenge for the title again, Mourinho said: "I don't know".
There could also be change in United's full-back positions as West Ham are lining up a January swoop for club captain Antonio Valencia, according to the Sun.
"I know an agent who met Man City and Man United on the same day", Mitten told the Beyond the Pitch podcast.
In that team, Nemanja Matic and Scott McTominay started in a back three alongside Phil Jones, none of them returned to the defence at Old Trafford on Wednesday.
"Another thing is if they stop, or if the financial fair play makes them stop and then we can close the gap a little bit better".