And then there were four: the inside line on Champions League semi-finalists

PSG play Bayern Munich and Atletico Madrid face Arsenal in the Champions League semi-finals with the first legs to be played this week

Arsenal are aiming to reach a first Champions League final in 20 years. Pic: AP Photo/Kirsty Wigglesworth

And then there were four. The Champions League has reached its semi-final stage as defending champions PSG, German giants Bayern Munich, Spanish powerhouse Atletico Madrid and Premier League leaders Arsenal chase European glory.

Ahead of the final-four showdown, we preview the teams and the state of play in the build up to the first leg clashes.