Giroud capitalises on Neuer error before stoppage time Mesut Ozil goal secures win.
Arteta tells IBTimes UK Sanchez is yet to reach his peak with the Gunners.
The Spaniard spoke with IBTimes UK ahead of the Champions League crucial game with the Bundelisga giants.
Gunners host the Bundesliga giants looking for their first points of the Champions League campaign.
Dutch winger remains out with a thigh injury but Lewandowski and Kingsley Coman are both fit
Robben has not played since early September.
The Gunners produced a superb second-half performance to defeat Watford on Saturday 17 October.
The Gunners secured a 3-0 victory at Watford on Saturday 17 October.
Arsenal travel to Vicarage Road for Saturday's late kick off.
Manchester City face AFC Bournemouth in a Premier League clash on Saturday. Find out how to follow the match live in the UK.
Gunners boss slams Neville following suggestions he does not prepare his players correctly.
Arsene Wenger target reveals truth behind Arsenal reported approach.
Real Madrid were also reportedly interested in securing his services.
Arsene Wenger says Premier League stragglers Chelsea still have the quality to recover from their poor start.
Gunners chief executive defends Arsene Wenger's failure to sign outfield player over the summer.
Sir Chips Keswick slams questions regarding the payment but refuses to explain the reasons for it.
Arsene Wenger says Sanchez will be assessed after playing two World Cup qualifiers for Chile
Celta Vigo forward's first choice is understood to still be a return to the Nou Camp.
Mikel Arteta and Mathieu Flamini also possible squad members for the upcoming Premier League tie.
Sanchez defies fitness concerns by playing full 90 minutes in Lima ahead of Premier League return.
Wenger instructs his scouts to only bring him players who shine away from home.
Club sporting director recently admitted Nolito could leave the club if any suitors meet his £13.5m clause.