What would a football team be without its fans? Going to a game and being part of the thousands of people that sing chants frantically and feel more passion than in any other event.
Sure, every club has followers, but not all of them are lucky enough to have that support as a key element in every meeting. Let's take a look to 10 of those teams:
AC Milan has won 18 league titles, so there's no question as to why they have so many fans.
The Rossoneri can show off a base of loyal supporters that last season topped the attendance category, with a total of 1,017,045 spectators.
La Bombonera is one of the most legendary stadiums in America. It's also the home of Boca Juniors, Argentina's most successful club, having won over 50 titles all over the world.
La 12 (the 12) is one of the oldest groups of Boca supporters. Fans tend to jump, which makes La Bombonera vibrate, but the fans say the stadium beats.
Borussia Dortmund's fans couldn't be happier. The Borussians are the current leaders of the Bundesliga with 43 points, just two away from archenemy Schalke 04.
The passion of the supporters can be understood through attendance. This season, the Signal Iduna Park has received an average of 80,380 people per game out of a total of 80,720 seats—that's 99.5 percent.
The Bhoys have one of the most loyal fan bases. Last season they had the highest attendance, with a 48,968 average. Currently, the Scottish Premier League reports an average of 49,426 fans per home game.
Fenerbahçe is a Turkish football club that has won 18 Süper Lig titles and has been runner-up in the tournament 16 times.
The squad's ground is Şükrü Saracoğlu Stadium, which is located in Istanbul and has capacity for 50,500 supporters. It's a unique stadium in Turkey in that it doesn't have a running track that separates the stands from the field.
Galatasaray's latest Süper Lig title came in the 2007-2008 season. The Türk Telekom Arena hosts 56,600 supporters in the home matches and is one of the toughest fields in world football.
On March 18, 2011, Galatasaray recorded the loudest crowd roar in a sport stadium. Guinness World Records reported that the fans' chants were as loud as 131.76 decibels (dBA). Here is a decibel comparison chart.
The brand new Juventus Stadium has a capacity of 41,000 seats and hosts a very passionate group of fans.
The Bianconeri have had an average of 31,709 spectators in their 2011-2012 meetings, who chant "Inno Juventus"—Juventus Anthem—at the top of their lungs.
"You'll Never Walk Alone" is probably one of the most famous football anthems in the world. Liverpool fans sure know how to support their team and make their rivals feel uncomfortable.
Anfield's capacity is 45,522; this season the average attendance is 44,842, or 98.5 percent of capacity.
"Aux Armes"—Call to Arms—is the traditional chant of Olympique de Marseille's fans.
The Stade Vélodrome can host 42,000 people. According to the Ligue1, Marseille has the best attendance when playing at home, with 94.4 percent (40,539).
The Red Star Belgrade fans, also known as Delije, surely know how to make hell rise, even when the team hasn't won the Serbian SuperLiga since the 2006-2007 season.
The Zvezda play at the Red Star Stadium, the largest in Serbia; it can host 55,500 people.