Allegri was sent off towards the end of the game for his fierce protests over refereeing decisions.
Al-Nassr top the standings and are two points clear of second-placed Al-Hilal. Al-Ahli are fourth on 25 points.
Real appointed former Spain manager Julen Lopetegui on Tuesday, but Allegri had been among the front-runners to take over from Zidane, who quit after winning a remarkable three successive Champions League trophies.
AC Milan named unheralded Massimiliano Allegri as their new coach on Friday, propelling the former Cagliari boss to the hotseat of one of Europe's top clubs just two years after he was managing in the third tier.
AC Milan coach Massimiliano Allegri was fired on Monday following a series of dismal results from the seven-times European champions.
Massimiliano Allegri is on course to become AC Milan's next coach despite a hold up over his contract at former club Cagliari.
It was hard not to feel sorry for AC Milan coach Massimiliano Allegri and his players after they were on the wrong end of a Barcelona backlash in the Champions League on Tuesday.
Juventus coach Massimiliano Allegri shunned the plaudits after his side move closer to the treble by beating AS Monaco to reach the Champions League final on Tuesday.
News of all that's transpired on and off the football field
Juventus supporters coach Massimiliano Allegri has often been in his element when he is apparently on the back foot.
When Juventus coach Massimiliano Allegri was greeted with a hail of eggs and spat at on his first day at work he could not have imagined he would lead them to the brink of an unprecedented treble of titles in his first season.
Coach Massimiliano Allegri dismissed suggestions that the newly crowned Serie A champions have nothing to lose
AC Milan manager Massimiliano Allegri has hit back at claims from the mayor of Verona that Mario Balotelli is a troublemaker, saying the problem of racism lies with supporters not the Italy attacker.
Juventus coach Massimiliano Allegri criticised his players for letting their guard down and losing 2-1 at arch-rivals Inter Milan after taking the lead in the second half at the San Siro.
Former Arsenal and Chelsea defender Ashley Cole says English players are afraid of leaving their comfort zone and playing overseas.
Juventus have appointed Thiago Motta as their new head coach to replace Massimiliano Allegri, the Serie A club said on Wednesday.
Didier Drogba would be a great addition to AC Milan's squad, coach Massimiliano Allegri said on Wednesday as Italian media speculated that a deal was in the offing.
AC Milan were booed off the pitch after suffering a shock 1-0 home defeat by Atalanta in Serie A on Saturday following a second-half Luca Cigarini strike that stunned the San Siro.
When Massimiliano Allegri arrived in Turin last July, Juventus ownership had set two goals for him - win a fourth straight "Scudetto" and reach the Champions League quarter-finals.
Juventus coach Massimiliano Allegri complained about his team's finishing after the Serie A leaders were held to a goalless draw at Fiorentina.
News of all that's transpired on and off the football field
Clarence Seedorf will need to tap into all the experience he gained as the only player to win the Champions League with three different clubs if his AC Milan side are to get past Atletico Madrid into the quarter-finals.
Mario Balotelli came off the bench to help 10-man AC Milan record a 2-0 victory at Genoa on Friday that tightened their grip on third place in Serie A ahead of Tuesday's Champions League return match with Barcelona.
A stunning Mario Balotelli free-kick gave AC Milan a 2-1 win over mid-table Parma in Serie A on Friday that put them level with third-placed Lazio and a point ahead of rivals Inter Milan in the race for European places.
Juventus coach Massimiliano Allegri said Cristiano Ronaldo has told him that he will stay at the club this season, something the new boss believes guarantees goals for the Serie A giants.
AC Milan are battling to sign Barcelona's Zlatan Ibrahimovic after their disappointing pre-season but the Swede is unlikely to be on board for Sunday's Serie A opener at home to promoted Lecce.
Juventus scored three goals in the opening 19 minutes to destroy AS Roma 4-1 and move three points clear in Serie A on Saturday.
Football tranfer news and speculations from across Europe.
IMAGES from football matches played across Europe on Wednesday.
AC Milan forward Ronaldinho is on the verge of leaving the Serie A leaders after media reports on Saturday said he had left the club's training base in Dubai to return to Brazil.
AC Milan coach Massimiliano Allegri said Saturday' shock 2-0 defeat at promoted Cesena was the perfect wake up call for those who thought the Rossoneri would crush all comers this season.
Zlatan Ibrahimovic's much-anticipated return to Barcelona was scuppered on Monday when the AC Milan striker was injured in training and ruled out of Tuesday's Champions League Group H opener at the Nou Camp.
Substitute Alexandre Pato netted a superb winner after Robinho had opened the scoring using the top of his arm as Serie A leaders AC Milan ground out a precious 2-1 win at Chievo on Sunday.
Juventus landed a fourth successive Serie A crown, and their first under coach Massimiliano Allegri, with four games to spare by winning 1-0 at Sampdoria on Saturday.
AC Milan reached an agreement with Barcelona on Saturday to bring former Inter Milan striker Zlatan Ibrahimovic back to Italy in a move the club hope will ignite their title chances.
Juventus need to beat Manchester City to reach the Champions League knockout stages on Wednesday and many fans still believe the best way to achieve this is by fielding Alvaro Morata and Paulo Dybala together in attack.
Juventus may have become the only club to lose six European Cup finals but they took heart from pushing Barcelona to the limit in Saturday's riveting final and restoring the honour of Italian football, coach Massimiliano Allegri said.
For Napoli, the match highlighted their struggling form, marking three consecutive defeats across all competitions for the first time since October 2016. They are fifth with 24 points.
Real Sociedad will join Atletico Madrid, Real Madrid, and LaLiga champions Barcelona in Europe's elite club competition next season.
Stopping prolific Barcelona forwards Lionel Messi, Neymar and Luis Suarez in the Champions League final will be a formidable task, Juventus coach Massimiliano Allegri said after his side clinched their place in next month's showpiece in Berlin.