Juventus’ poor run in Serie A extended to just two wins in 11 games as they were held to a disappointing 0-0 draw away at city rivals Torino.

Massimiliano Allegri’s side, who were top of the league when they beat Lecce on January 21 but who now trail leaders Inter Milan by 19 points having played a game more, failed to break down their mid-table opponents as their astonishing collapse in form dragged on into another week.

It was the third game in four in the league in which they have failed to score and leaves them vulnerable to being caught in the race to qualify for the Champions League, with fifth-place Roma able to cut the gap on them to five points should they win their game in hand.

Dusan Vlahovic had Juve’s clearest chances of the first half, first when he knocked Federico Chiesa’s cross against a post, then again when he was foiled by Vanja Milinkovic-Savic in the Torino goal.

The goalkeeper was called on again to deny the visitors, diving at full stretch to keep out a firm low effort from Kenan Yildiz.

Duvan Zapata thought he had given Torino the lead when he crashed the ball home shortly after half-time, only for his effort to be ruled out for a foul committed by Raoul Bellanova against Juve’s Filip Kostic.

Antonio Sanabria rose highest to meet Bellanova’s cross midway through the second half, drawing a good save from Wojciech Szczesny as Torino threatened.

The hosts might have made it a truly disastrous night for Allegri when Karol Linetty’s ball in was turned over the crossbar by Valentino Lazaro, who seemed to make contact with the ball with his neck with the goal gaping.

It concluded a frustrating encounter for Juve, and came in stark contrast to the comfortable 2-0 win they enjoyed in the derby back in October, when the team were in the early stages of what looked a credible title challenge.

It leaves Allegri’s side in a fight to ensure they do not miss out on the Champions League for a second consecutive season.

They still have the possible consolation of the Coppa Italia to aim for, and play the second leg of their semi-final away to Lazio on April 23 looking to defend a 2-0 aggregate lead.

Napoli’s dismal season continued as they succumbed to a seventh defeat of the season in Serie A, losing 3-0 at Torino.

Antonio Sanabria, Nikola Vlasic and Alessandro Buongiorno got the goals as Walter Mazzarri’s defending champions had another miserable afternoon.

A dismal afternoon for the visitors was compounded by the 50th-minute dismissal of Naples-born wing-back Pasquale Mazzocchi, less than three minutes into his debut.

They are now winless and without a goal in four matches and lie 20 points behind leaders Inter Milan.

Napoli had a 20-3 aggregate goal advantage in the last eight meetings of these two teams in Turin, winning seven and drawing the other.

However, it was destined to be the hosts’ day from the moment Sanabria broke the deadlock two minutes before half-time.

Duvan Zapata flicked an Ivan Ilic free-kick on for the Paraguay international, who tucked the ball away left-footed from six yards.

Napoli’s hopes of getting back into the contest were killed off as they made a sloppy start to the second half.

Zapata had already forced Pierluigi Gollini into a save at his near post less than two minutes after the restart when the visitors were reduced to 10 men.

Mazzocchi, a half-time substitute for Piotr Zielinski, had been on the pitch for  three minutes when he received a yellow card for a high, reckless challenge on Valentino Lazaro. However, referee Maurizio Mariani then decided to dismiss the 28-year-old Napoli debutant, following VAR intervention.

Torino soon doubled their advantage, Vlasic beating Gollini with a well-placed low right-footed shot into the corner two minutes later.

Sanabria hit the post from eight yards and Zapata failed to tuck the rebound away from close range, with Gollini blocking with his foot then scooping the ball away before it could cross the line.

However, the dominant hosts made it 3-0 in the 66th minute when central defender Buongiorno headed home a Lazaro corner.

Giovanni Simeone skied an 80th-minute attempt at a consolation goal, capping a miserable Napoli display as Torino moved to within a point of their ninth-placed opponents.