Probable line ups:

Roma:
Julio Sergio, Cassetti, Burdisso, Juan, Riise; De Rossi, Pizarro; Taddei, Perrotta, Vucinic; Toni

Chievo:
Sorrentino, Frey, Mandelli, Yepes, Mantovani; Luciano, Rigoni, Marcolini; Pinzi; Bogdani, Abbruscato

I believe we will see at least three goals here. Roma plays efficient football lately, scoring goals and also receiving. Two of the last three meetings have been ended with Over, and even in that "Under" meeting were fallen two goals. Here are the results:

06.01 ITA 1 Cagliari-Roma 2:2 (0:0)
20.12 ITA 1 Roma-Parma 2:0 (0:0)
16.12 UEFA CSKA Sofia-Roma 0:3 (0:1)

Here we must add the fact that new signing Luca Toni will play from the beginning of a match. This means that Ranieri will play with two attackers, and this is the biggest reason for Over 2.5 goals.

Chievo on other side knows to be dangerous as visitor. On two of the last three performances as visitor Chievo scored a goal and I guess they are able to repeat that at Olimpico.

20.12 ITA 1 Napoli - Chievo 2-0 (1-0)
06.12 ITA 1 Livorno - Chievo 0-2 (0-1)
22.11 ITA 1 Sampdoria - Chievo 2-1 (1-0)

Assuming that Chievo will score at least one goal in this match, then Roma must score twice to win. A big disadvantage for domestic team is absencee of captain Totti, but guests are not complete either - Moro, Scardina, Pellissier, Pinzi, Morera and Rigon are out, as well as suspended Sardo. Domestic players will certainly take seriously this meeting bearing in mind that Chievo stay unbeaten in the last two performances on Olimpico. Roma last victory dates back to the 2005/06 season when they won 4:0. I expect that Vucinic and Luca Toni will will start a good partnership in the attack.