A word for someone who comes from one city but supports a team from a different city?

Is there a word that describes someone who, for example, supports Manchester United but was neither born nor brought up in Manchester but comes from another city in the UK?

I'm not looking for a rude or humorous word but rather a descriptive one.

Solution 1:

Plastic fan (or just plastic) fits your description, but it tends to be a derogatory term. Here is the Urban Dictionary entry:

A person who roots for a Non-Hometown team based on that teams good record.

Solution 2:

Not a single word answer, but glory hunter fits the bill if the supported club is more successful than the hometown club.