Agree. I don't see any reason to consider chelsea as too strong. We have seen many times in the last season that the team failed to play well against smaller teams. In the semi- finals , Chelsea will face a team whose performance surprised us all.
Fluminense, despite being a small team , is playing well in the fifa club World cup . Fluminense has defeated strong teams like Al Hilal and Inter Milan in the knockout rounds. The team shared points with dortmund in the group stage. On the other hand, Chelsea has not faced any strong team so far. Chelsea even lost 3-1 against Flamengo in the group stage. So even though chelsea is a renowned team, they have a big chance of being defeated.
Yes you are right if someone ignores Fluminense maybe it will be very foolish for them. Because Fluminense is playing very well at the moment and they are in very good form. Although Fluminense is a much smaller team compared to Chelsea but with the performance Fluminense is currently in, it will be very difficult for Chelsea to beat Fluminense. We have seen how Fluminense has beaten its opponents and come this far. When playing with Al Hilal and Fluminense I thought that maybe it will not be a very competitive game and Fluminense will lose to Al Hilal very easily. But we all know what happened in the middle of the match.