Although not a Beckham fan at all, this will be the most recognised player I've seen play in person.
I mean, Sydney FC is my second team, being local to me, and I go to a lot of their matches, but never seen players who are too important.
Had:
-Yorke (gone)
-Carbone (gone)
-Juninho (this season)

Playing for Sydney
and the most recognised player from a foreign team is probably Shinji Ono from Japan's Urawa Reds in the Asian Champions League.
Should be pretty good, apparantly Zidane to play for Sydney in a guest appearance. Finally get to go to a match with a bit of talent on show!
Oh how I envy those of you who can see Arsenal play on a fairly regular basis, alog with all the class players this brings.