Midfielder Vidal is a serious doubt for the semi-final tie between the Champions League heavyweights after suffering a knee injury in training at the weekend.
The Chile international underwent surgery to correct the problem and now faces a race against time to be fit in time for the home leg against Madrid next Wednesday.
“It’s a Bayern problem, he’s an important player,” Zidane - speaking ahead of his side’s LaLiga fixture against Athletic Bilbao on Wednesday - told a media conference.
“We feel sorry for his injury, but it will not change anything. Bayern is still the same.
“They have a very strong squad, with important players, and they will replace him.”
The European champions progressed through to the last four of the competition thanks to a controversial penalty awarded in the closing stages of their quarter-final clash with Juventus.
Cristiano Ronaldo converted from the spot to seal a dramatic 4-3 aggregate victory after referee Michael Oliver judged Medhi Benatia had bundled over Lucas Vazquez inside the area.
Zidane once again defended Madrid in his pre-match press conference, adding: “The anti-Real Madrid people always existed. But, in fact, I think there’s more and more Real fans day by day.
“In general, I think people respect what we are doing. I am not here to defend Real Madrid everyday, but I must do it when they are unfair [criticisms].”
