Arsene Wenger's side is coming off a 2-2 draw with Chelsea at home. Caretaker boss Gary Brazil will have to massively up the ante for Forest to have any chance of knocking out the cup holders in the third round.
"I spent time you would not believe going to see how managers worked, travelling in my vehicle at night and watching the training in the morning, then going back home again".
Aaron Ramsey remains out with a hamstring injury and Granit Xhaka has been ruled out with a groin problem so Jack Wilshere is nearly certainly going to be rested this weekend after starting our last six games.
Football reporter Paul Brown provided comments from Wenger before the Gunners' recent win at Crystal Palace, with the Frenchman suggesting the Forest trip will be too soon for Aaron Ramsey, Olivier Giroud and Nacho Monreal.
Forest's attack is led by Daryl Murphy, who is by no means a stranger to Premier League-level opposition.
Nottingham Forest recently sacked Mark Warburton in controversial fashion after owner Evangelos Marinakis deemed him to have under performed in his role as manager.
Theo Walcott has hardly featured for the visitors this season in the Premier League although he remains a threat in the cup competitions for coach Arsène Wenger's men, with four goals in eight appearances.
"Alexis Sanchez, Mesut Ozil, Jack Wilshere and Alexandre Lacazette won't play but the real concern is that defence".
Goalkeeper: Petr Cech is expected to get a rest with David Ospina coming in between the sticks as the Colombian worldwide has been our first choice keeper in the other cup competitions.
Arsenal's FA Cup tie is followed by an EFL Cup fixture against Chelsea. Per Mertesacker will come back in because Calum Chambers is absolutely broken.