Real Madrid manager Zinedine Zidane said that his side's sequence of 30 unbeaten outings provides motivation each time they play.
"What we want to do is to continue doing what we are doing, knowing that there are moments during the game where things are not going for us," Zidane said after their 2-1 win over Sporting in Group F.
"To have gone so many games without losing is an extra motivation and we want to keep moving forward knowing that when you win matches, you go out more motivated next time," he said.
Real Madrid are 30 games unbeaten in all comps since April 2016 (W23 D7) ? pic.twitter.com/yRYnjoGWT6
— Champions League (@ChampionsLeague) November 22, 2016
Zidane said he was happy with the effort in Portugal.
"We had our difficult moments in the game, but that is normal," he said. "In the previous game against us Sporting played with the same intensity and they didn't drop their heads after going behind."
He picked their second goal as the moment that turned the match.
"But we managed to score a wonderful second goal through Karim Benzema. It was important that we won here; we achieved what we came to get. We are going to play a final against Dortmund now."
Dortmund, who romped to an 8-4 win over Legia Warsaw, travel to Madrid next month, with the winner to claim top spot, although the visitors have a two-point advantage in the case of a draw.
Madrid's next outing is against Sporting de Gijon in La Liga on Saturday.