By John Cross Eric Dier believes an “outstanding” atmosphere at the Allianz Arena can help blow Arsenal away in the Champions League. Bayern Munich ’s former Tottenham defender Dier believes his team have rediscovered belief and confidence after beating Cologne in the Bundesliga ahead of Wednesday’s European second leg. It was Bayern’s first clean sheet in ten games even though they did lose Kingsley Coman and he joins Serge Gnabry on the injured list for the Arsenal game. Dier said: “We have to defend as a collective on Wednesday and show the right energy. The atmosphere and the support from …