(Reuters) - Atletico Madrid coach Diego Simeone is wary of Borussia Dortmund's strength at home as his side prepare for the return leg of their Champions League quarter-final on Tuesday having taken a 2-1 lead from last week's first game.

Atletico, looking for their first Champions League semi-final place in seven years, beat Dortmund at the Metropolitano stadium on Wednesday but Simeone acknowledged the German side's power at home, which could cause an upset in the return leg.