No links to this guy as yet, but I'd like to throw in a name for consideration by everyone;
Juan Sánchez Miño. Plays for Boca. Until now his primary position has been LM, however he has played LB a few times lately and looked pretty good. I was reminded of Zanetti because of his nickname,
Il Tratore. Would be appropriate for this guy. Hopefully he plays more often in LB, proves his talent in that position and we can look into him. At 22 he may be a late emerger, but that also means will probably cost less without the 'wonderkid' tag. I haven't seen particularly much of him, just a little bit, so maybe someone who watches Boca play often will give a better picture of him.
If you never saw him, here's a match tape of him against Racing Club de Avellaneda. His shirt number is #28 for reference.
After checking the news, unfortunately he has actually been connected to Juventus. Rumoured price 5M. I think management should seriously consider bringing in this guy as understudy to Zanetti, so Il Capitano can guide him along and can be his replacement at LB. Rumoured price Boca would want is 5M so not exactly going to break the bank.