Watch Champions League live on ITV: Arsenal v Dortmund

Olivier Giroud has found form in Europe. Photo: PA

Arsenal could take one huge step towards qualifying for the knockout stages of the Champions League by beating Borussia Dortmund live on ITV.

The Gunners have been victorious in their first two outings against Marseille and Napoli, but will face toughest test against last year's competition runners-up.

With the likes of Robert Lewandowski and Marco Reus set to start for the Germans, Arsene Wenger will know it will be in a for a difficult night at the Emirates.

Watch Arsenal v Borussia Dortmund live on ITV, ITV.com and mobile at 7.30pm on Tuesday 22 October