Liverpool produced one of the greatest comebacks in Champions League history to beat Barcelona 4-0, overturning a three-goal first-leg deficit and advancing to their second successive final with a 4-3 aggregate victory. After wild celebrations at Anfield, Klopp said: 'Playing against the best team in the world. Winning with a clean sheet, I don't know how the boys did it.' Liverpool will play the winner of the other semi-final between Ajax Amsterdam and Tottenham Hotspur, with the Dutch side leading 1-0 from the first leg in London. Subscribe to Guardian Football ► http://is.gd/GuardianFootball Support the Guardian ► https://support.theguardian.com/contribute The Guardian on YouTube: The Guardian ► http://www.youtube.com/theguardian Guardian Sport ► http://bit.ly/GDNsport Guardian News ► http://www.youtube.com/guardianwires Owen Jones talks ► http://bit.ly/subsowenjones Guardian Culture ► http://is.gd/guardianculture