Basel will compete in an evenly-balanced Champions League group including Europa League holders Chelsea. The Swiss champions were drawn in Group E, alongside Chelsea, Germany's Schalke and Steaua Bucharest of Romania. Egypt forward Mohamed Salah played well against the Londoners in last season's Europa League semi-final, but couldn't help his team avoid defeat. The group stage opens on September 17. The Groups Group A: Manchester United, Shakhtar Donetsk, Bayer Leverkusen, Real Sociedad Group B: Real Madrid, Juventus, Galatasaray, Copenhagen Group C: Benfica, Paris St-Germain, Olympiakos, Anderlecht Group D: Bayern Munich, CSKA Moscow, Manchester City, Viktoria Plzen Group E: Chelsea, Schalke, Basel, Steaua Bucharest Group F: Arsenal, Marseille, Borussia Dortmund, Napoli Group G: Porto, Atletico Madrid, Zenit St Petersburg, AustriaVienna Group H: Barcelona, AC Milan, Ajax, Celtic