Mazzarri comes off contract next month.
"Since this summer, when I said I'd take a decision at the end of the season, I continue to state there is one game left. So, I continue to hold out and will explain everything straight after the final game, which is tomorrow against Roma.
"I don't know if it'll be tomorrow night or in a few days, but I will explain my decision. I am not avoiding the question, but there is specific timing in football and that can change an action from positive to negative.
"If I say we have to wait until the last round, there is a reason for that. The reasons will become clear soon."