Napoli’s indifferent form continued as they were held to a goalless draw by relegation-threatened Hellas Verona at Stadio Diego Armando Maradona.
The Serie A leaders are 14 points clear but have now won just one of their past four games in all competitions.
Fit-again top-scorer Victor Osimhen came off the bench and hit the bar but the hosts could not find a winner.
After Lazio won at Spezia on Friday, Napoli need 11 points from eight games to clinch a first title since 1990.
Head coach Luciano Spalletti rested a number of players, including Khvicha Kvaratskhelia, but the winger was summoned from the bench in the second half as the home side struggled to find the breakthrough.
Matteo Politano did have the ball in the net in the first half, but his deflected effort was ruled out due to a Napoli player in an offside position obstructing Verona goalkeeper Lorenzo Montipo.
Osimhen had the best chance of the second half but shot against the woodwork before Cyril Ngonge nearly won it for 18th-placed Verona – but he shot wide after going through on goal.