Barcelona are one of three clubs left in Europe that can still win the treble: league, cup and Champions League. The Catalans last won it in 2015.
Manchester City and Ajax are the other two clubs still in with a chance to become part of a select group of football history. Barça are already part of that group having won two trebles in the last decade.
Ernesto Valverde's side are 11 points clear in La Liga this season, into the Copa del Rey final against Valencia and, after Wednesday's first leg, have a 1-0 lead over Manchester United in the Champions League quarterfinal.
According to UEFA, Europe's treble winners are:
1966/67: Celtic
1971/72: Ajax
1987/88: PSV Eindhoven
1998/99: Manchester United
2008/09: Barcelona
2009/10: Inter Milan
2012/13: Bayern Munich
2014/15: Barcelona
Now, three more teams are trying to add their name to that list -- Barça for a record third team.
Barcelona
Champions League: Quarterfinal (0-1 win against Manchester United in first leg, second leg at Camp Nou on April 16).
Liga: 1st, 11 points clear of Atlético Madrid.
Copa: Final vs. Valencia on May 25.
Manchester City
Champions League: Quarterfinal (1-0 defeat against Tottenham in first leg, second leg at home on April 17).
League: 2nd, two points behind Liverpool with a game in hand.
FA Cup: Final vs. Watford (Wembley).
League Cup: Winners.
Ajax
Champions League: Quarterfinal (1-1 draw against Juventus, second leg in Turin on April 16).
League: 1st, level on points with PSV Eindhoven.
Cup: Final vs. Willem on May 5.
