Arsenal midfielder Aaron Ramsey admits they can't slip up against Champions League opponents Montpellier.

Ramsey had admitted the clash with ­Montpellier is a must-win game.

After losing at home to Schalke last time out, Arsenal face a battle to reach for the knockout stages with Greek outfit Olympiacos a real threat. The Wales midfielder said: "The group is tight. We must win. We are at home, so hopefully we can do that and put ­ourselves in a strong ­position to qualify.

"But we know Mont­pellier can be a threat. It will be no push-over."