There have only been eight trebles of league, cup and UEFA Champions League. Anyone for a ninth?
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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:
There are now only four teams remaining in the UEFA Champions League, but are any still in the running to join that elite band this season?
UCL: Semi-finals v Tottenham (30 April a, 8 May h)
League: 1st, level on points with PSV Eindhoven
Cup: Final v Willem II, 5 May (Rotterdam)
UCL: Semi-finals v Liverpool (1 May h, 7 May a)
League: 1st, nine points ahead of Atlético Madrid
Cup: Final v Valencia, 25 May (Seville)
UCL: Semi-finals v Barcelona (1 May a, 7 May h)
League: 1st, two points ahead of Manchester City
Cup: Out, lost v Wolverhampton Wanderers in third round
League Cup: Out, lost v Chelsea in last 32
Tottenham Hotspur (ENG)
UCL: Semi-finals v Ajax (30 April h, 8 May a)
League: 3rd, 21 points behind Liverpool
Cup: Out, lost v Crystal Palace in last 32
League Cup: Out, lost v Chelsea in semi-finals
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 Saturday 20 April