I know Chelsea will do well next season but can we take out the Argentine winger you mentioned, adding Garnocho to Chelsea squad is not an upgrade to the team. I'm not saying he would flop like he did at Manchester United but there are wingers already in Chelsea that they don't need anymore of them. Chelsea will do well in the next Champions League, at least they won't be leaving after the first 8 matches, how they played against PSG in the final shows what they can do if they reunite in the same spirit playing in the Champions League, every stage in the Champions League should seem be another final to them.
The fact about Chelsea is that everyone is expecting them to perform well in the upcoming season because of their performance in the Club World Cup final. If they can maintain their mentality and perform as well as they did at the end of the Club World Cup, I don't think they will face any difficulties next season. Chelsea's Premier League performances were extremely poor, and since they won the Club World Cup, that is why all Chelsea fans are having hope about their performance in the upcoming season.
That's not what everyone thinks, at least those who understand that the Club World Cup is more or less meaningless as a predictor for next season. The teams still change, PSG lost 0-3 in the final and nobody would think that if PSG and Chelsea play against each other in the Champions League, the game would end like that. It was a brand new competition run in a rather unknown place with unknown surroundings. That's about as bad as it can get to be taken as a predictor for future events.