A look at the seven teams to have completed the European treble of domestic cup, league and Champions League titles in a season.
Both Juventus and Barcelona, who meet in Saturday's Champions League final at Berlin's Olympic Stadium, can claim the treble of trophies having already won their domestic league and cup.
CELTIC (Scotland) 1966/67
Billy McNeill's "Lisbon Lions" scored 196 goals over the course of a ground-breaking season as they became the first European team to win the treble with only three non-Scottish players in the first-team squad.
Having won the Scottish league by three points from Rangers, they beat Aberdeen 2-0 in the Scottish Cup final before travelling to Lisbon whey they won 2-1 against Inter Milan with goals from Tommy Gemmell and Stevie Chalmers.
Jock Stein's side actually finished with five titles in a fairytale season as they also lifted the Scottish League Cup and Glasgow Cup, all with a team born within 40 kilometres (25 miles) of the city, according to legend.
AJAX (Netherlands) 1971/72
Johan Cruyff was the architect of Ajax's all-conquering season as the Dutch giants defended the European Cup with their own brand of total football.
Cruyff scored both goals in their 2-0 win over Inter Milan in the European Cup final at Dutch rivals Rotterdam and they won the Eredivisie from Feyenoord by eight points.
Cruyff finished as the league's top-scorer with 25 goals out of Ajax's haul of 104 Eredivisie goals.
A fortnight before the European Cup final, they beat FC Den Haag in the Dutch Cup final, which like the continental decider was at Rotterdam's Feijenoord Stadion.
EINDHOVEN (Netherlands) 1987/88
Guus Hiddink's side had an even more spectacular domestic season than Ajax in 1971/72, scoring 117 goals in topping the Dutch league for a third consecutive time and beat Roda JC 3-2 in the Dutch Cup final.
The European Cup final against Benfica in Stuttgart finished goalless, but the Dutch held their nerve to win the shoot-out 6-5, converting all of their penalties before Antonio Veloso was denied by Hans van Breukelen.
The season was all the more impressive as Eindhoven had sold Ruud Gullit to AC Milan at the start of the season.
MANCHESTER UNITED (England) 1998/99
Alex Ferguson's side wrote themselves into Champions League history by winning the final in one of the most dramatic finishes.
With Bayern Munich winning 1-0 in Barcelona, Ferguson threw on England striker Teddy Sheringham and Norway's Ole Gunnar Solksjaer, who turned the game in added time.
Sheringham equalised in the 91st minute while Solksjaer tapped the winner past Germany goalkeeper and Bayern captain Oliver Kahn in the 93rd minute to win United's first European Cup final since 1968.
They squeezed through the group stage as a best runner-up and made a stunning comeback in the second leg of their semi at Juventus, coming back from 2-0 down to claim a 3-2 victory with goals by Roy Keane, Dwight Yorke and Andy Cole.
They won the Premier League title by just a point from Arsenal and beat Newcastle United 2-0 in the FA Cup final, but had Keane and England midfielder Paul Scholes suspended for the epic European final at Barcelona's Camp Nou.
BARCELONA (Spain) 2008/09
At 38, Pep Guardiola became the youngest coach to win the Champions League title when Lionel Messi-inspired Barcelona beat Manchester United 2-0 in the final in Rome to become the first Spanish team to win the treble.
Barca travelled to Rome having already wrapped up the Spanish league by beating Real Madrid 6-2 at the Bernabeu in a key victory at the start of May before winning the Copa del Rey with a 4-1 win over Athletic Bilbao.
INTER MILAN (Italy) 2009/10
Samuel Eto'o was part of another treble-winning team having switched from Barcelona to Milan in the summer of 2009 as Jose Mourinho's side swept aside all-comers in Italy.
The Nerazzurri won the Coppa Italia 1-0 against AS Roma at Stadio Olimpico with a Diego Milito goal and less than two weeks later he was on target again in a 1-0 victory at AC Siena that saw Inter beat Roma to the Italian league title on the final day.
Mourinho's side faced Bayern Munich in the Madrid final with Milito scoring both goals as Louis van Gaal's Bavarians were well beaten in the first of their three final appearances in four seasons.
BAYERN MUNICH (Germany) 2012/13
Jupp Heynckes delivered Germany's first treble in his final year as Bayern coach as the Bavarians dominated the Bundesliga in a record-breaking season.
They won the league title by collecting 91 points to finish 25 ahead of second-placed Dortmund, who they beat 2-1 in the Champions League final at Wembley in an all-Bundesliga affair with Arjen Robben scoring the winning goal.
With the European and league titles in the bag, Bayern then headed to Berlin to beat Stuttgart 3-2 in the German Cup final a week after their Wembley triumph to complete the treble as Heynckes bowed out in style before Guardiola took over for the 2013/14 season.
Source: AFP
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