I actually saw the information of some of them as injured on a website but sometimes these sources don't write the actual reason why. If they are really injured then Bayern Munich might be finished...
The so-called injury list is like this: de Ligt, Laimer, Musiala, Sane, Coman and Gnabry. Upamecano's condition is also said to be doubtful. I hope that most of them would be able to catch up with the first leg otherwise we are likely to watch a one-sided game in my opinion.
I see that Gnabry, Sane and Upamecano are currently in question, meaning there is a possibility that they will play against Real Madrid. And among the significant players who will definitely miss this match are Coman and Marusic. Real Madrid, by the way, also has problems in defense, Carvajal, Mendy and Alaba will miss this match, so this could be important for the Bayern аttack, especially the absence of Carvajal could become a problem for Real.