Napoli coach Rafa Benitez admits three Champions League points against Marseille is a must.
Napoli host l'OM on Wednesday.
"It's going to be a very important game for us," he told Eurogoals. "Especially since we have Borussia Dortmund and Arsenal coming up.
"It's going to be a real challenge to qualify , so it's critical that we beat Marseille. It is true that they are going through a difficult period, but they have quality in their squad.
"We can't relax and think it'll be easy. That would be unforgivable."
