For example: I'm a Chelsea FC supporter but if Chelsea FC weren't exist at all, I would support Spurs. What about you? :) 

*It should be the same league*

In the same league, it would have to be FC Barcelona. I love their philosophy and the importance of youth products. I wish Valencia would model after their academy.

Tottenham

Valencia

Despite them hating us, i would go all in for Feyenoord. they play great, the fan support is forever loyal.

Tottenham too :)

I already support an American club but if both Tottenham and Sounders dissapear some reason i would support Boca Juniors.

nothing like that team.

Boca or Feyenoord. haha.
forgot i put feyenoord up there.

Tottenham
Dortmund

One of the 2

Olympique Lyonnais

@Vendetta, Coyspurs2008, Ramaboy & FredTilson That's not in the same league you support :)

@AB sorry!

Atlectico probably! Rivals of Madrid!

Then Everton probably. 

@Alex: Don't you think it's a bit unfair if I can only choose from the league of the club I support? 

@Vendetta No it's not unfair because it shows that you don't hate any club in the league you support and would still support it. This post is just to show your loyalty to the league you supporting. So if there is no Chelsea you wouldn't support any club in the EPL? 

Or I could possibly support two leeagues at once. I'm sorry, but I don't see any club that would be so special to me to make me support it if Chelsea ever disappeared. If I was forced to pick, the closest thing would be Leeds... And they're in the npower Championship.

To answer your question though, I would just watch the EPL from a neutral point of view.

Newcastle

Athletic Bilbao!

arsenal or swansea. I just like to watch them play.

Borussia Dortmund hands down.
I've respected them so much for their achievement. Especially Jurgen Klopp!
He's bought players to create an amazing team with a limited transfer budget. It's 
amazing to see how it pays off to start small! I'm starting to now read the history 
of Borussia Dortmund and learn all about the club.