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,

Arsenal manager Mikel Arteta opted to select Leandro Trossard in his attack for the Champions League semi-final first leg against Paris Saint-Germain on Tuesday.Starting line-ups for the Champions League semi-final first leg between Arsenal and Paris Saint-Germain at the Emirates Stadium on Tuesday.