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,

One team, Barcelona rejuvenated by Flick and fueled by a title victory over bitter foes Real Madrid. The other, an Inter Milan that, despite a recent trouncing in the Coppa Italia, still has the audacity to silence any stadium.

Barcelona will host Inter Milan in the first leg of their UEFA Champions League semi-final clash at the Estadi Olimpic Lluis Companys on Wednesday night.