I would rank the clubs in London by success on the pitch and size of fanbase and stadium facilities league position etc. I would say that they fall into three groups, Big, Medium and Small and my current ranking would be as follows.
1. Arsenal
2. Chelsea
3. Spurs
4. West Ham
5. Palace
6. Fulham
7. QPR
8. Brentford
9. Charlton
10. Millwall
11. Orient
12. AFC Wimbledon
What he should've said was, '' With QPR, I was playing for a medium sized club in London ... '' or not mentioned the size at all as he was joining what was then a team in the Premier League. Theoretically he is playing for one of the smallest clubs in Swansea.