Napoli on Sunday missed a chance to regain the top position in the Serie A standings they lost last month after they were held to a goalless draw by Venezia.
The Veneto side are next to last in the premier league table.
Napoli now have 61 points from 29 matches - level with leaders Inter and three points ahead of Atalanta with the two teams however set to play later on Sunday.
"We must never switch off our brains", said Napoli coach Antonio Conte after the goalless draw, adding that his team "risked losing" on Sunday.
"We will fight with a knife between our teeth, the positive thing is that, after eight games, we finally didn't take any goals", he added.
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