The Napoli boss says his side is unlikely to win Serie A this term because of the relentless form of Roma and Juventus.
The Partenopei currently sit third in the table, behind both Roma and Juventus, and the Spaniard believes both clubs ahead of them will have to collapse.
"We have faith that we can do good things in the league, but if Juventus and Roma keep up their current performances, it will be tough," he told reporters.
Napoli faces Swansea in the Europa League on Thursday, and the former Chelsea boss is full of respect for the Welsh side.
"They're a team I know well. They did very well when I was in England. Tomorrow, we will try to impose our game," he said.
Napoli played out a 1-1 draw with Genoa in Serie A on Monday, but Benitez says his side are not in danger of fatiguing, despite its commitments in the Coppa Italia.
"There are no problems from a physical standpoint," the manager said. "The team are still going - look at the game against Roma. The key tomorrow will be to manage our emotions."