FC Barcelona face a tough challenge to repeat in Group A (Action Images)

MONACO, Aug 24 (SW) - Here are the results of the 2006/07 UEFA Champions League group stage draw, conducted at Grimaldi Forum in Monaco on Thursday.

Reigning champions FC Barcelona were given an incredibly daunting draw after being placed in Group A with fierce European rivals Chelsea, German contenders Werder Bremen, and upstart Bulgarian debutants Levski.

Chelsea and Barcelona first became acquainted in the 2004/05 competition when the Blues stunned Barça 5-4 on aggregate in the Round of 16, but Barcelona exacted their revenge last season at the same hurdle with a 3-2 aggregate win.

Barcelona and Werder Bremen were also paired together in Group C last season, making Group A a very familiar one, and turning into a baptism by fire for Levski.

Nine-time winners Real Madrid are paired with a familiar foe in Group E, as French side Lyon will again travel to the Bernabéu. Last season in the group stage, Lyon earned a win and a draw against the Spanish side en route to the quarter-finals.

Madrid will also have to travel to the east of Europe on two occasions to take on both Steaua and Dynamo Kiev. The Romanian side, winners of the competition in 1986, are back in the group stage after a 10-year hiatus and Dynamo Kiev were paired with Madrid in the group stage as recently as 2004/05.

The draw also produced yet another Battle of Britain as Manchester United will face Scottish champions Celtic in Group F. The Red Devils are also paired with Benfica, with whom they played in last season's group stage, and with first-timers FC København, fresh off their shock elimination of Ajax.

Group C will see Erik Gerets' return to PSV Eindhoven, but as manager of Turkish side Galatasaray and it is the second straight year PSV are grouped with a Turkish side, playing against Fenerbahçe last season.