The Gunners have lost two and won three of their last five Premier League games and they will be looking to get their top-four push back on track with victory over Huddersfield on Saturday.
They have taken only two points in six away fixtures since then. Denis Suarez may take more time before he gets ready to start games.
Mkhitaryan has not played since Arsenal's defeat to Southampton in December but returned to training ahead of the City match and featured for Arsenal's Under-23s on Monday.
With just 17 away wins out of the 50 games played since August 2016, the issue has been something Emery would have been keen to resolve when he replaced Arsene Wenger.
Barcelona loanee Suarez was handed his debut during Sunday's 3-1 defeat at Manchester City.
"We know it's not going to be easy, that's for sure, because we are up against some great teams such as Chelsea and Manchester United but we need to try and stand firm as a team and battle in every game". Today he is working with different adaptation and better than last week.
"It's not to think we're playing under pressure, it's to be demanding and also with ambition to be in the top four".
"We have to continue in our way with passion and also stay calm, but above all we must work hard and take a good feeling in training and then show it in the match".
Mustafi was heavily criticised along with teammate Stephan Lichtsteiner for his performance against Manchester City at the weekend, leading to former Liverpool defender and current Sky Sports pundit Jamie Carragher to claim that he has not been good enough ever since he arrived. "Also knowing other teams, they have an advantage to us".