The Naples outfit needed a late goal to secure a 1-1 draw at home to relegation-threatened Chievo on Saturday, leaving themselves just four points ahead of Fiorentina, who have a game in hand, in third place.
"It is a difficult moment," the Spaniard told Mediaset. "I do not think we are on course to qualify for the next edition of the Champions League.
"We still have to play in the Europa League and the Coppa Italia. We could have done better, but the situation could be worse."
Napoli face Lazio in the Coppa Italia on Wednesday.