The new Champions League format leaves plenty of margin for error for clubs aiming to reach the knockout rounds, and yet European heavyweights such as Real Madrid and Paris Saint-Germain are currently at risk of an early exit.

Kylian Mbappe hoped his move to Real Madrid would finally see him end his wait to win the Champions League. Instead, the France international and defending champion Madrid are in danger of being eliminated from European club soccer's elite tournament at the first stage after Wednesday's 2-0 loss to Liverpool leaves them in a fight just to make the playoffs for the next round.