PSG, Real Madrid toil as giants struggle to get to grips with new Champions League

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.With eight matches now in the league phase rather than six games in the old group stage, there is more margin for error than before, but there is more jeopardy too.