Over the past few seasons, English football has been dominated by two fantastic club sides.
Both sides missed out on historic seasons. With a week to go before the FA Cup and Carabao Cup are played, they end with just the two.
Although they won their fourth title in five years, they had only one trophy of the season.
We thought about the greatest club sides of all time. You can vote for the best at the bottom of the 10 legendary teams we profiled. Let us know which side you would have picked if you had chosen other.
Torino was known as the kings of Italian football in the 1940s, known as Il Grande Torino.
They were on the verge of a fifth consecutive Italian title on May 4, 1949, but everything changed after World War II.
Torino's entire squad died in the Superga air disaster.
They won the Double in 1942-43, but in 1947-48 they won the Serie A title with 125 goals and a goal difference of + 92.
Real Madrid dominated the European Cup in the early years.
They won the first five tournaments. Only three teams have won more than five European Cups.
Real did not win La Liga in 1969 but they did win 12 Spanish league titles.
They scored 92 goals in 30 games in 1959-60, but lost on goal difference.
In the European Cup final, Alfredo di Stefano and Ferenc Puskas scored seven goals each.
The 1960s saw the dominance of the Brazilian football team, which won six national titles and two South American crowns in the Copa de Campeones de America.
They scored 157 goals in 46 games in 1962, winning four trophies.
They won the national, continental and world competition in 1963.
Between November 1960 and October 1963,Santos went on a 54 game winning streak, a world record at the time.
They didn't enter the Copa Libertadores from 1965 because they were travelling the world to play games.
Celtic won the version of the quadruple that was up until the final minutes of the Premier League season, and it was the only European side to ever do it.
They won the Scottish league, Scottish Cup, Scottish League Cup and the European Cup and scored 196 goals.
The Lisbon Lions are the first British team to win the European Cup.
Winning was important, but it was the way that we won that made me happy. We did it by playing football. There was no negative thought in our heads.
All 11 players came from within 30 miles of Celtic Park.
There were nine consecutive league titles this season.
At the height of their Total Football phase, Ajax won three European Cups in a row.
They won the Dutch league, Cup and European Cup in a row, as well as a record run of 26 wins in a row.
They beat Inter Milan 2-0 in the European Cup final, after winning every home game in the competition.
The greatest scorer in the history of the game was the legendary Johan Cruyff.
The dominance of the 1970s and 1980s sides has left a long way to go for the current team.
They won 10 league titles in 15 seasons from 1975-76 to 1989-90, but it was hard to remember which was their best season.
The Reds won four European Cups in eight years, the last of which was in 1984 when they won the European Cup, First Division title and League Cup.
That was the first season in charge for Joe Fagan, who had worked under Bill and Bob.
Ian Rush had 47 goals in all the competitions. The spine of the team was made up of key players from Scotland, including Alan Hansen, Kenny Dalglish and Graeme Souness.
The AC Milan side built with the money of former Italian prime minister Berlusconi went on to win 10 major honours in nine years, including three European Cups.
Paolo Maldini, Franco Baresi, Frank Rijkaard, Roberto Donadoni, Carlo Ancelotti, and Marco van Basten were some of the legends in their team.
The 1988-89 season ended with Milan lifting the European Cup thanks to the help of the Belgrade fog.
They defended the European Cup the following year after beating Steaua Bucharest in the final.
Their team at the turn of the decade is considered to be their peak after they won the European Cup and Serie A in 1993-94.
Sir Alex Ferguson retired from Manchester United in the summer of 2013 after 26 years at the helm.
The best part of that time was the Treble of the Premier League, FA Cup and European League.
Even if their most famous XI only played twice, United became the first English team to win the big three trophies in one season.
Their trophies were close-run. They won the title by one point on the final day, and then scored two goals in injury time to beat the Germans in the final.
The dream almost ended when they were down to 10 men and faced a penalty in injury time in the FA Cup semi-final replay, but Peter Schmeichel saved from Dennis Bergkamp.
Barcelona were Europe's dominant force for about a decade in the 2000s and 2010s, but they reached another level during the last four years.
The 2010-11 team was even better than the 2008 team. The best team Ferguson has faced is the one that beat his side in the final of the European club competition.
They won the La Liga title with 96 points, only allowing 21 goals in 38 games, and beat United in the final at Wembley.
Lionel Messi scored 53 goals in front of the famous trio of Xavi, Iniesta and Busquets.
Jupp Heynckes was the coach of the team that won everything in the 2012-13 season.
They started the season with the German Super Cup.
Their victory in the final was a close one, as they beat fellow Germans Borussia Dortmund 2-1 at Wembley thanks to Arjen Robben's 89th-minute winner.
Most points, best goal difference, most wins, fewest losses, and biggest margin of victory are some of the records that have been broken or equalled by the team. They topped the table for 34 weeks.
Their top scorer was Thomas Muller with 23 and third place went to Franck Ribery.
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