The first legs of the UEFA Champions League semifinals are over, and now it's scenario time to know just what's needed to move on for a spot at the most coveted trophy in club soccer. Paris Saint-Germain's 1-0 win at Arsenal has the French club in a fantastic spot to make it to the big game though there won't be much room for error against the Gunners.

The Champions League semi-final second legs are this week. These are the key tactical questions for the two managers

The PSG superstar suffered a hamstring injury in the second half of the first leg putting his availability into doubt.