The UEFA Champions League does not have three knockout qualifying rounds.
 Therefore, if both the Champions League and Europa League title holders come from the same top-four association and finish outside of the top four of their domestic league, the fourth-placed team of the league will not compete in the Champions League and will instead compete in the Europa League
 Real Madrid and Barcelona hold the record for the most appearances in the group stage, having qualified 25 times, followed by FC Porto and Bayern Munich on 24

