Arsenal in the toughest Group In the UEFA Champions league draw 2013/2014 as they face Napoli, Marseille and Dortmund

Manchester City will face holders Bayern Munich in the group phase of the UEFA Champions League, while Arsenal have been drawn alongside last season's runners-up Borussia Dortmund, and Celtic have been handed a mouth-watering group.

Chelsea have been given a relatively kind-looking route to the last 16, while Manchester United will also be quietly optimistic of progressing to the knockout stages.

Celtic have been set the toughest task of the British clubs to qualify for the last 16 after the Scottish champions came out in Group H.

The opponents for Neil Lennon's side are Barcelona, who they faced in last season's group phase, Italian giants AC Milan and Dutch champions Ajax.

The Bhoys, who clinched their place in the draw after a dramatic play-off comeback against Shakhter Karagandy, memorably beat Barcelona at Parkhead in last season's group stage last November with a dramatic late goal from Tony Watt.

Milan and Ajax add further glamour to the group, and the four clubs between them have won 16 European titles.

City have been given a good chance of reaching the knockout rounds for the first time after landing two high-profile groups in the previous two years.

Though Manuel Pellegrini's side will have to tackle reigning champions Bayern, City will also face Russian outfit CSKA Moscow and Viktoria Plzen from the Czech Republic.

Arsenal, who reached the group phase after a comfortable 5-0 aggregate success over Fenerbahce in the play-offs, have been handed a testing draw in Group F.

In addition to facing Dortmund, Arsenal will also meet French side Marseille and Napoli, who are now coached by former Liverpool and Chelsea boss Rafa Benitez.

The Gunners, who have reached this stage of the competition for 16 successive seasons, also played Dortmund in their group two years ago.

Champions League draw:

Group A: Manchester United, Shakhtar Donetsk, Bayer Leverkusen, Real Sociedad
Group B: Real Madrid, Juventus, Galatasaray, FC 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, Austria Vienna
Group H: Barcelona, AC Milan, Ajax, Celtic

On that occasion Dortmund finished bottom of the section but the Germans are now a much tougher proposition and impressed throughout their run to the final last year. read more on Skysports