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

Go back to 2010 — when Lamine Yamal was not even 3 years old and Lionel Messi was close to his prime — and Camp Nou was the scene of one of the most memorable matches in Champions League history,