There have only been eight trebles of league, cup and UEFA Champions League. Anyone for a ninth?
Eight teams and seven different clubs have claimed 'the treble' over the years, winning the European Cup, league title and biggest domestic cup in the same campaign:
1966/67: Celtic
1971/72: Ajax
1987/88: PSV Eindhoven
1998/99: Manchester United
2008/09: Barcelona
2009/10: Internazionale Milano
2012/13: Bayern München
2014/15: Barcelona
Which clubs are still in the running to join that elite band this season or even, in Manchester City's case, claim a quadruple?
Ajax
UCL: Quarter-finals
League: 2nd, five points behind PSV Eindhoven
Cup: Final v Willem II, 5 May (Rotterdam)
Barcelona
UCL: Last 16, 0-0 v Lyon, second leg 13 March (h)
League: 1st, seven points ahead of Atlético
Cup: Final v Valencia, 25 May (Seville)
Bayern München
UCL: Last 16, 0-0 v Liverpool, second leg 13 March (h)
League: 2nd, level on points with Dortmund
Cup: Quarter-final v Heidenheim, 3 April (h)
Juventus
UCL: Last 16, 0-2 v Atlético, second leg 12 March (h)
League: 1st, 16 points ahead of Napoli
Cup: Out, lost v Atalanta in quarter-finals
Lyon
UCL: Last 16, 0-0 v Barcelona, second leg 13 March (a)
League: 3rd, 22 points behind Paris
Cup: Semi-final v Rennes, 2/3 April (h)
League Cup: Out, lost v Strasbourg in quarter-finals
Manchester City
UCL: Last 16, 3-2 v Schalke, second leg 12 March (h)
League: 1st, one point ahead of Liverpool
Cup: Quarter-final v Swansea City, 16 March (a)
League Cup: Winners
Manchester United
UCL: Last 16, 0-2 v Paris, second leg 6 March (a)
League: 4th, 13 points behind Manchester City
Cup: Quarter-final v Wolverhampton Wanderers, 16 March (a)
League Cup: Out, lost v Derby in last 32
Paris Saint-Germain
UCL: Last 16, 2-0 v Manchester United, second leg 6 March (h)
League: 1st, 17 points ahead of LOSC Lille
Cup: Semi-final v Vitré or Nantes, 2/3 April
League Cup: Out, lost v Guingamp in quarter-finals
Porto
UCL: Last 16, 1-2 v Roma, second leg 6 March (h)
League: 2nd, two points behind Benfica
Cup: Semi-final 3-0 v Braga, second leg 3 April (a)
League Cup: Out, lost v Sporting CP in final
Key
Won competition
Can still win competition
Out of contention
*League Cups are played in a minority of countries, including England, France and Portugal. Celtic, in 1966/67, are the only team to have won a quadruple of European Cup, domestic league, domestic cup and domestic league cup.
Standings accurate up to and including Tuesday 5 March