Anything can happen. Even a team you did not expect to win or even perform well will surprise you. That is how football works, and for that, even Chelsea can win the UCL.
Football cannot be predicted every time successfully, we ha e to try our best, because these players and their respective teams are also trying all their best to ensure that they emerged for the best and to the last, the UEFA Champions League title is what every team has been aiming, same also, we can't tell who may win for this new season, until we see how far they all can go in it.
Of course, we can only predict but that doesn't mean that our predictions will be correct. Anyone that wants to predict which club would be the Champions this season can do so but I feel that it's too early, because the competition hasn't gotten to its peak yet. Sometimes, the club that we feel will do better ends up being the worst in performance. Take a chill pill and let the season decide.