Who can topple Real and Messi chases Ronaldo – Champions League talking points

Holders Real Madrid will launch their title defence in Glasgow when this season’s Champions League group stage gets under way on Tuesday evening.

Carlo Ancelotti’s men face Scottish champions Celtic in their opening Group F fixture while on the same night Paris St Germain and Manchester City set out on their latest quest to lift European club football’s biggest prize for the first time.

Here, the PA news agency takes a look at some of the talking points ahead of the long road to Istanbul.

15 minutes of training ahead of Paris Saint-Germain - Juventus