The most difficult games for Madrid in my opinion will be the La liga games. The champions league games seem to be something they know how to deal with because teams from other countries don't really know how to play Madrid, but La liga teams have understood them and will give them more difficulty.
Real Sociedad is going to be a difficult game because aside from the injuries, more Madrid players were on international duties than Sociedad players so that gives them a little advantage too.
Well I don't think so IMO, Madrid has been qualifying to play in UCL for so many years ,they played with alot of teams so that strategy thing is out for me....they wouldn't have made it through to last year's final if not for some overlooked mistakes by opponent and this is mostly die minute win though Madrid has a strategy of playing fast pressing games in their last minutes but I think those stuffs that happened last year won't repeat itself especially Bayern, Bayern could have reached the finals if not for the last minute subs . Thus saying Realmadrid won't have difficulty issue in UCL with their current squad doesn't seem right to me.