If there is such a club, I would say Inter Milan and if I am wrong tell me as Inter Milan could be the Arg national squad I mean they field Samuel, Burdisso, Cambiasso, Zanetti, Crespo and Cruz but you guys get my meaning
No team outside of argentina has more argentines than Inter but Villarrel has I think 5 argentines and I believe Atletico has 4 starters that are argentine, Aguero, Maxi, Leo franco and I'm not to sure if Banega starts for them.
Inter is just South American in general. They have 6 Argentines but they also have 5 Brazilians, 6 if you count one that's out on loan. Catania has 7 Argentines.
Porto FC have 7 Argentines Nelson Benítez Lucho González Lisandro López Mariano González Mario Bolatti Ernesto Farías Tomás Costa and 4 Brazilians and 2 Uruguayians
Surely, it's Inter Milan. Although Catania and Porto have more argentineans, not all of them are not NT players. While arg players in Inter Milan were or are NT players and more familiar to us. But the issue is half of them couldn't get enough play time, so the number might decrease... And Real Madrid and Atletico Madrid have the potential to be the new 2nd home to arg players as both have four players in squad now and possible arg increment later.