Paris Saint-Germain coach Unai Emery and Arsenal manager Arsene Wenger are on opposite trajectories when the Champions League resumes for their teams on Tuesday at the Parc des Princes. It will be Emery's first Champions League game as PSG's coach, while Wenger is starting a 19th consecutive campaign in Europe's most prestigious competition. On the Champions League opening day, five-time winners Barcelona hosts Celtic - a team it inflicted six goals on the last time they played in the group stage - and Bayern Munich takes on Russian newcomers Rostov. More...