The only name that crosses my mind here is Zidane, having played for Juventus and Real. But I somehow think there might be someone else, much earlier...
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#2 and #3 refer to english footbal only. I admit that I have no idea about that.
So... Madrid has been represented by Real and Athletico, that´s for sure. London obviously with Chelsea and Arsenal. Porto had Boavista and FC in the semifinals last year IIRC. Glasgow? Celtic was last year, and I´m quite sure Rangers did, too, although I cannot tell the year (sorry to hurt your scottish soul). And again rather obvious: Milano (Mailand in german, what is the english name?)
No search engines inviolved in my answers.
Infact, I didn´t dare to answer first, but seeibng that no one else would either...
Excalibur
Aviendha's Englishman