If Manchester City, Real Madrid and Bayern Munich are the top three clubs in the Champions League, then I think one more club should be added here and that is Arsenal. Maybe we don't see such a good performance from Arsenal in the Champions League, that's why we can't put this team in the list of favorite teams. Injury problems are unwelcome and can happen to every club, but Arsenal's players are known to have the most injuries every season. If you have looked at Arsenal's performance in the last Champions League season, they have not performed where we would consider them the best team for the Champions League.
Arsenal need to plan to do well in the Champions League in the same way that Real Madrid plan to win the Champions League trophy. They should consider the Champions League tournament as mandatory, leaving the Premier League as a secondary option, but they will do well in the Champions League
I am also favouring these three clubs for best in Champions League, but Arsenal is still needed time for having better results and performance because their performance in last season was not as top club I will add Inter Milan as fourth-best club because they are doing good job and having good squad which can give his best in all conditions and also having ability to win this trophy due to their experience and quality performance Arsenal is having troubling time as their players are having pressure as they are heading for big games.
In last two seasons, they were good in Premier League and their performance in Champions League was not satisfied, but we can expect improvement which will help them for keeping things in good touch if they are able to have some strong mentality in this coming season then we can expect they will be going through for the cups.