It is a match in the Bundesliga competition, not in the Champions League, which in general Kompany's squad can handle well because the strength of the Stuttgart team itself this season is a little different from last season. As for the match in the Champions League, it seems that Kompany will have a little more pressure because Bayern Munich will face Barcelona, who this season has experienced very good development in strength, although I also have no doubts about Bayern Munich's strength this season in any competition.
I know that the game between Bayern Munich against stuttgart is not in Champions League, but a game in Bundesliga. But why I discussed about the game was because, @Fiatless said that the game between Bayern Munich against Stuttgart is the game that will determine his prediction on how Barcelona game will end. That is why I discussed about it, not that I didn’t know that the game i discussed about was not a game of the Champions League but Bundesliga. So don’t mistake my discussion.
To be fair, it is not really that far away, because if you see a team doing not so ideally well at Bundesliga (or whatever team on their own league) then there is a good possibility that the game would matter for UCL game as well.
Meaning, if Bayern Munich is not doing great at Bundesliga, it means they may not be great at UCL neither, doesn't have to be like that and we could see some changes there is no doubt about that, like a team COULD technically be bad at league and be good at Europe, I have seen Sevilla be terrible at league but win Europa many times, but usually that is not the case. So the league games matter a lot, for example I was afraid after Barcelona lost to Ossasuna, and conceded 4 goals as well, I feared they would be terrible at UCL too, didn't happen and I was happy to win my bet, but I still feared.
So, the league games and the champions leagues are sort of connected, not directly but has relevance and talking about what happened at league games to be able to judge the UCL games before you bet isn't bad move. Doesn't mean Bayern will lose to Barcelona, just means there is a higher chance, there could be something wrong and the risk is there, it is not an easy game, both teams are very close to each other.