3. Partizan Belgrade
The fact that Partizan Belgrade has one of the strongest fan base in Europe has made them an important presence- despite of the fact that they don’t have much European glory to adorn. But get this- the Ultra groups of Partizan Belgrade love the football club, more than they love their lives. It’s almost like a primary religion to them and they will never tolerate you saying degrading words about the football club. If you’re team is playing home against Belgrade- make sure you book your seats far in advance because chances are that these guys will have already booked much of the seats for themselves- to make the home club feel like as if they’re playing away!