Probable starting eleven:

Milan:
Abbiati; Papastathopoulos, Bonera, Yepes, Antonini; Flamini, Thiago Silva, Emanuelson; Robinho; Pato, Ibrahimovic

Lazio:
Muslera; Lichtsteiner, Dias, Biava, Radu; Gonzalez, Ledesma, Brocchi, Mauri; Hernanes; Kozak

I think Under 2.5 goals is a good option for this game. First of all, Milan is in series of three games with Under 2.5 goals in Serie A. Here are the results:

29.01. Catania - AC Milan 0:2
23.01. AC Milan - Cesena 2:0
16.01. Lecce - AC Milan 1:1

Second, Lazio is without two main strikers as Rocchi is injured, while Zarate is suspended. No doubt this is gonna be a big handicap for the coach Edu Reja.

Third, both teams have many absences. Milan is without injured Boateng, Zambrotta, Inzaghi, Amelia, Nesta, Gattuso, Seedorf, Strasser, Ambrosini and Abate, while newcomer Van Bommel is suspended following the red card he received against Catania. Very similar situation in Lazio squad as Del Nero, Meghni, Garrido, Diakite and Floccari are injured. And I already mentioned Rocchi and Zarate.

And the last reason is determined by the fact that the last two mutual games between Milan and Lazio ended with Under 2.5 goals. Here are the results:

22.09.2010. Lazio - AC Milan 1:1
28.03.2010. AC Milan - Lazio 1:1

I expect another match with no more then two goals.