The difference in terms of their strength is too far but indeed in real football things like this can be for Galatasaray to try to hold back with a draw.
Now we just need to see what scheme they will show in this match. Trying to keep up with the game from Bayern I don't think this will be too good for Galatasaray but waiting with the parking bus could also be complicated for them so they need to think carefully about what they should do in this match.
Football is full of surprises. Yes, Manchester United's performance was very bad and they lost against Galatasaray, but we should not ignore the good game Galatasaray played. On paper, Manchester United were superior, but at the end of the match they left the field without scoring any points.
Bayern Munich is a very high quality team and they are improving their game every match. But we know that Galatasaray is a team full of surprises. If Galatasaray does not concede 1 goal at the beginning of the match and the first half of the match ends 0-0, we may see surprises on the field for the second half.
Now it depends on the strategy that Bad Okan will do in this case because looking at their current condition the defense that Galatasaray has is not too strong and they still need a lot of things they need to do to fill the bad gaps.
Mistakes in strategy, especially for clubs like Bayern, can be fatal, especially Bayern are always dominant when in the Champions League group phase. At the moment Galatasaray's only chance is to try to make a scheme for this match to be a draw but the rest I would not expect much because the possibility of losing is very large for this.