Arsenal boss Arsene Wenger feels their Champion League chances will be decided against Olympique Marseille.

Marseille, managed by ex-Chelsea star Didier ­Deschamps, have won in Greece at ­Olympiacos and at home to Borussia Dortmund.

"That was a very good result because I rate Dortmund highly," said Wenger.

He is also boosted by Arsenal's European results. They drew in Dortmund and beat Olympiacos - and had the beat the Italians of Udinese to reach the group stage.

"That was an under-rated performance," said Wenger. " Udinese are top of their league."