Indeed, Chelsea performed well in the UCL. They have a chance to win like Tuchel. But with the current conditions I doubt it. I don't think current players can compete with Man City, Munich or other big clubs. In 1/16 they will play Dortmund. I don't underestimate Chelsea, but Dortmund can always surprise. Chelsea must be vigilant. Even though that game is still a long way off, there is a chance Chelsea make a big transfer maybe that could change the chances of getting to the Final.
I don't think that any transfer can seriously change the chances of the teams (unless of course it's Haaland + Mbappe, but they hardly want Chelsea plus they can no longer play for another club in the Champions League this season). Maybe we will see Ronaldo's move that has been talked about so much? He's not showing anything special this season, but he has a certain Champions League magic associated with him.
when a team manages to sign other players, it causes a lot to change in the team and even if they are not very famous players, you always see some change, whether good or bad. for example in chelsea's case if they manage to sign some good attacking players then this will improve chelsea's attack a lot and if the injured players can improve then also the team will already be fine, for example kante is an excellent chelsea player who he is injured, but when he gets better and if chelsea also managed to bring kane from tottenanham then they would already have a very strong team. about cristiano ronaldo, he'll probably go to saudi arabia, i've read that he's actually going to saudi arabia to play, so far i feel kind of sad and i really hope he can change his mind, but that would only happen if some team wanted him