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,

Treble watch continues for Paris Saint-Germain and Barcelona, both of whom have already collected their first trophies of the season and are perhaps the most formidable candidates

According to Opta, Arsenal are the favourites to win the Champions League with a 31.3% chance after sensationally knocking out Real Madrid. Barcelona are second in line with a 27.4% chance of winning their seventh European crown, while PSG have a 22% shot at lifting the famous trophy in Munich.