Napoli boss Rafa Benitez was left frustrated after their 1-1 draw with Atalanta.
Gonzalo Higuain struck again to cancel out German Denis' opener for Atalanta.
"It's a shame, as we played very well, created chances and were in control. Once again the opposition goalkeeper was Man of the Match," Benitez told Sky Sport Italia.
"Callejon's miss is truly inexplicable. It's true we make errors in defence, but above all we wasted so many scoring opportunities. We've seen teams who concede as many goals as we do, but don't control the match to that degree, which is where the regrets really come from.
"We can only keep working to understand our individual errors and improve on them.
"I think this performance should make the team even more determined. If we play every game with this mentality and determination, then we will do well."
