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,

From 36 clubs down to the final four. The Champions League semis pits Arsenal against PSG, with the first leg in North London on Tuesday.

Germain, and Inter Milan entertain Europe and the world as the semi-finals of the Champions League begin. All four teams will be dreaming of booking their place in the final in Munich on May 31st.