Bayern Munich fail to impress ahead of showdown with Manchester City

Pep Guardiola insists his Bayern Munich side must improve ahead of Wednesday's Champions League clash at Manchester City after stuttering to a 1-0 win over VfL Wolfsburg.

Despite enjoying their customary 70 per cent ball possession at Munich's Allianz Arena, Bayern needed just over an hour to break down the Wolves defence.

"We won, but we must improve a lot of things," the Spaniard conceded ahead of the trip to England and Saturday's Bundesliga clash at third-placed Bayer Leverkusen.

"We had a few problems in the second half which we need to solve. I am certain that we will put in a good performance in Manchester and at Leverkusen."

Bayern and City are battling for top spot in group D after winning their opening matches with Munich seeing off CSKA Moscow 3-0 at home and City winning 3-0 at Viktoria Pilsen.

But against a dogged Wolfsburg defence Bayern's finishing and passing let them down in a below-par performance.

"We presented ourselves well in terms of how we battled away," said Thomas Mueller, who scored the winner. "Wolfsburg gave us nothing and it was far from a walk in the park for us. They played almost man for man against us, which gave us a few problems and we can be pleased that we won."

Borussia Dortmund prepared for their Champions League clash at home to Marseille tomorrow with a 5-0 rout of 10-man Freiburg to stay top.