Man City boss Mancini wary for Borussia Dortmund stars Lewandowski, Gotze
Both players have been linked with City in the past.
"For this reason I think it will be a very difficult game. In my opinion Dortmund are one of the best teams in Europe. They won the Bundesliga. They are very strong and in players like Robert Lewandowski and Mario Gotze they are dangerous going forward. If we concede space, like we did in Madrid, we will make it difficult for ourselves."