So far, Chelsea's performance in the Premier League has not been optimal. Mudryk's arrival is expected to improve Chelsea's performance, especially with several transfers made by Chelsea.
Sorry but in the past with about $100M, clubs can buy players who won Ballon d'Or and made their names in World Cup and Euro tournaments. Nowadays, they bought $100M players but I don't know who they are and how they play. When I saw such transfer news, I have to Google, Youtube to find videos about those players.
I did not know who is Mudryk before his transfer to Chelsea. Weird to buy him at $100M, it's so expensive and money wasting.
But against Dortmund I don't think it will be too difficult for Chelsea because Dortmund this season has also been very bad and they haven't started to come back like Chelsea did.
In fact, these two teams are teams that are currently in a slump this season, but if you look at the output of the two teams, of course, Chelsea is still the favorite to beat Dortmund.
Chelsea are like Manchester United a few seasons ago. They got crisis and lost their plans for transfers and over paid for transfers to buy players who have yet demonstrated their quality too well. Because they have high demand, when they ask other clubs to buy players, they receive abnormal high offers. Like Manchester United bought Maguire at very expensive transfer price.
Dortmund have a bad season too and they will meet Chelsea, another club that is in crisis too. Dortmund have less experience in Champions League than Chelsea and they have less quality players than Chelsea. Chelsea if playing at their full capacity, will win Dortmund but if Chelsea can not play well, they will face risk of losing against Dortmund.