How does it work?Thirty-six sides entered into the new "league phase" and now just four remain with a month-and-a-half to go in the UCL campaign.Barcelona, Paris Saint-Germain, Arsenal, and Inter Milan are through to the semifinals,

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

Paris Saint-Germain v Arsenal BBC Radio 5 Live PSG’s 1-0 win the first leg was their first ever victory in six attempts against Arsenal (D3 L2). Both of their home games against the Gunners have finished 1-1 (March 1994,