Probable starting eleven:

River Plate:
Vega, Ferrari, Ferrero, Sanchez, Manuel Díaz, Ahumada, Almeyda, Abelairas, Gallardo, Villalva, Canales.

San Lorenzo:
Migliore, Meza, Aguirre, Botinelli, Torres; Pintos, Rivero, Leiva, Kily González; Gomez, Alfaro.

The game between River Plate and San Lorenzo is hot derby. Maybe not like River Plate and Boca Juniors, but still it is derby. San Lorenzo is playing very good lately (I mean last seasons, not now) and that is why this games are very interesting. Now both teams are far from good. River Plate have no victory in last four games. Here are the results:

01.03. Gimnasia LP-River Plate 1:1 (1:0)
21.02. River Plate-Ars. Sarandi 1:1 (0:1)
15.02. Santa Fe-River Plate 1:0 (1:0)
07.02. River Plate-Rosario 0:0 (0:0)

On other side San Lorenzo is little better as they won last game against Tigre, but still, it is far from the expectations. Here are San Lorenzo last four games::

28.02. San Lorenzo - Tigre 1:0 (0:0)
21.02. Racing Club - San Lorenzo 1:0 (0:0.)
14.02. San Lorenzo - Velez 0:0 (0:0)
07.02. Estudiantes - San Lorenzo 2:0 (2:0)

Both teams are almost complete for today clash. River Plate couch Leonardo Astrada can't count only on Ariel Ortega who is injured. San Lorenzo couch Diego Simeone is without suspended Nelson Benitez and injured Juan Manuel Torres. And finally I will mention the tradition. It is interesting that three out of last four games when River Plate was host ended with a draw. Here is the results:

2008/09 ARG River Plate - San Lorenzo 0:0
2008 COPA LIB River Plate - San Lorenzo 2:2
2007/08 ARG River Plate - San Lorenzo 2:0
2006/07 ARG River Plate - San Lorenzo 0:0

I believe in similar scenario tonight. River Plate is big name in Argentinian soccer, but San Lorenzo can't be underestimate. Having on mind that San Lorenzo is based in Boedo, a part of Buenos Aires, then we can realize that home advantage isn't too big for River Plate.