Bayern Munich host the Spanish league leaders in the first leg of their Champions semi-final clash on Tuesday, but the German international insists that the club can do anything as long as the supporters are behind them.
"It's all or nothing [against Madrid]," he told the club's official website.
"We have to go to the limits, but we can do it with our fans behind us. It comes down to mental strength, the mentality marks Bayern out."
Jupp Heynckes's side currently trail Borussia Dortmund by eight points in the German Bundesliga.