Real Madrid anchorman Sami Khedira has hailed the team's resoluteness so far this season.
Los Galacticos are leading the way in La Liga and have won their opening three Champions League games without conceding.
Following their 3-1 victory at Hercules at the wekend, the Germany international insists they can see off AC Milan on the continent on Wednesday as they look to maintain their 100 per cent record this term.
"If we can keep a clean sheet, we will win the game. That is our goal. If you look at the big teams who have made it far in the Champions League, they have almost always been the ones who have conceded the least goals," he said.
"That is the key to success. A good defence wins titles, and so far that is what we have. We have let teams create very few chances, while we have a very good offence and our style of play is fast and attractive."