United are at Bayern for the second-leg of their Champions League clash.
Lahm said: "We have spoken about the goal we conceded in Manchester. As a team we are very good in zonal marking normally! We have spoken about this and trained on it during the week. Shinji Kagawa is a danger as is every other player. Manchester had only one chance [in the first leg]. And we will do what we always do. Through our own possession, we do not let anything happen to our goal."
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