They might just be football fans looking to take in a game.
Here I am a Brisbane Roar fan. But while travelling for business I have attended games involving other teams because I like football. In fact I make a point of mingling with the home fans to take in the home atmosphere of other teams. One of my best football experiences was a night taking in a Melbourne Victory game with the home fans. (They have a fantastic pub near the stadium!)
I am happy to take in any live football I can get. I even attended Grant Street for a Highland League match Clach V Cove (from memory.) Cheapest night of football entertainment I have ever had. Walked from Dalneigh to Grant St, ticket, food, drink, social club all for less the 25 quid - Bargain and I top night entertainment.