Speaking to journalists on a trip to Milan for a convention, the 65-year-old put his faith in his former employers, who are separated by a point at the top of Serie A.
"There's a long way to go in the league but those three will fight to the end for the title," said Capello. "Milan have the best squad but also the most commitments. They're strong, balanced and used to staying at the top.
"Napoli, on the other hand, have to get used to managing the tiredness and tension that build up from being in the Champions League. As they're not in the Champions League, Juve are among the favourites."