Marseille captain Steve Mandanda has insisted that it is vital for his side to beat Borussia Dortmund in the Champions League on Tuesday.

The two teams meet at the Westfalenstadion tonight both having lost their opening Group F matches, with Arsenal prevailing in France and the German outfit losing to Napoli.

"We knew it would be a tough group as soon as the draw was made," Mandanda told reporters.

"After the loss to Arsenal, it's even tougher. We really need to get a result in order to play an important role in this group."

Marseille make the visit to Dortmund on Tuesday.