If head to head records can be used to predict future matches, then I feel it’s not wrong to predict which teams may likely win the Champions League next season before the season start. In some past seasons, even before the season began, people made predictions and ended up being right. However, even when we see how teams perform early in the season, predictions can still turn out to be wrong.
I want to know how to use head to head if we don't know the teams will face each other because so far there is no match schedule. We can use head to head to make predictions when the two teams meet and it also does not determine the final result perfectly. Of course there is nothing wrong with predicting which team will win the Champions League but in conditions like now I think it is still too early because the league has not started and we also do not know the playing pattern that will be implemented by each coach.