Real Madrid definitely suffered (not financially haha) because of the Club World Cup - Bellingham could have had shoulder surgery right after the end of the season, but he postponed it until after the Club World Cup, so he will miss the beginning of the season and that will be a significant number of games. Bellingham is a key player for Real so it is very painful - first they have to assemble a team without him, then rebuild again.
Yeah that injury is really serious.
Bellingham is expected to be out for 3 months even though it says "unknown" on Transfermarkt. 
I wonder whether Xabi Alonso is thinking of making a signing for his position...
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Barcelona have an advantage in that they have had more rest, but I think that maybe for some players (Yamal) it is worse - the more free time the more likely he will go the way of Neymar (partying) 
That party was kind of crazy. Spanish government started an investigation about it because of "objectifying people with dwarfism".