Barca v Arsenal
Barca hold a 2-0 lead from the first leg in London at the Emirates Stadium.
Everyone has pretty much written off Arsenal from causing an upset at Camp Nou.
Barcelona are undefeated in 37 competitive games and haven't lost at home in over a year.
Arsenal need at least two goals to take it to extra time and they need to beat Barcelona for what would only be the second time eight meetings since 1999.
Barcelona are without Gerard Piqué who is suspended.
Either Jeremy Mathieu or Thomas Vermaelen will step in.
Arsenal are without Petr Cech, Aaron Ramsey, Alex Oxlade Chamberlain and Santi Cazorla due to injury.
It's easy to join Vital Barcelona