The 37-year-old, who took charge of the Giallorossi in the second half of 2010-11, is red-hot favourite to replace Luis Enrique, who has announced that he will leave the club at the end of the season.
Sabatini conceded that Roma are weighing up the merits of a move for Montella, who spent a decade at the club as a player, but insisted that there are other options on the table.
"We are thinking about Montella. He did very well at Roma and is doing very well at Catania, but he is under a contract," Sabatini told Mediaset Premium on Sunday.
"We will try to negotiate with Catania, but he is only one of the candidates.
"Marcelo Bielsa? This is a not a matter of nationality, we will decide regardless of that."
Former Chelsea coach Andre Villas-Boas is also under consideration to replace Luis Enrique, with the Portuguese trainer understood to be in advanced talks with the Serie A side.
Roma finished seventh in Serie A, with 56 points from 38 matches, and will not play in Europe in 2012-13.