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,

Paris St. Germain will be a tougher proposition for Arsenal when the sides meet for a second time in this season’s Champions League, the French club’s manager, Luis Enrique, said on the eve of their semifinal first leg on Tuesday.