Paul Pogba was handed a four-year ban in February 2024 after testing positive for DHEA, which boosts testosterone levels.
Yildiz gave Juve the lead after 21 minutes with a stunning curling shot from just inside the box, leaving goalkeeper Joel Drommel helpless as the ball went in off the inside of the post.
Allegri was sent off towards the end of the game for his fierce protests over refereeing decisions.
Premier League champions Manchester City were drawn on Thursday with Juventus, Wydad AC and Al Ain in Group G for next year's FIFA Club World Cup in the United States.
All the action from football matches played in Europe on Wednesday
Bayern Munich made it 16 wins from 16 games this season to underline their credentials as early Champions League favourites, beating holders Paris St Germain 2-1 away as Luis Diaz scored two goals and was shown a red card on Tuesday.
Jude Bellingham converted a penalty and Kylian Mbappe added another goal before halftime to spur Real Madrid to a 2-0 victory over Getafe.
IMAGES from matches played across European leagues on Saturday
Cristiano Ronaldo cleared to play opening matches at World Cup
Juventus have appointed Thiago Motta as their new head coach to replace Massimiliano Allegri, the Serie A club said on Wednesday.
A round-up of Tuesday's action in the UEFA Champions League.
Vinicius Jr came off the bench to score once and set up another goal to steer champions Real Madrid to a 4-1 fightback victory over Espanyol.
Kylian Mbappe scored twice from the penalty spot as Real Madrid fought back from a goal down to beat Olympique de Marseille 2-1 in their opening match of the Champions League group stage, at the Santiago Bernabeu, Madrid, on Tuesday.
Barcelona dropped their first points in LaLiga this season as Rayo Vallecano fought back to secure a 1-1 draw at home to the champions.
Manchester City have one just victory from their last 10 games across all competitions.
IMAGES from the UEFA Champions League matches played on Wednesday
Manchester City secured top spot in Group G of the Club World Cup with a 5-2 thrashing of Juventus on Thursday, exposing the Serie A side's defensive frailties in emphatic fashion.
A summary of Wednesday's action in the UEFA Champions League.
Real are on 24 points, two ahead of Barcelona and the top two will go head-to-head in next Sunday's El Clasico. Getafe are 12th in the standings on 11 points.
Manchester City's Erling Haaland came back to haunt Borussia Dortmund with a clinical finish against his former team, while Phil Foden bagged a brilliant brace as the hosts cruised to a 4-1 win in the Champions League on Wednesday to climb to fourth.
Ilkay Gundogan scored two goals as Manchester City comfortably dispatched Emirati club Al-Ain 6-0 on Sunday to ease into the knockout stage of the Club World Cup from Group G along with Juventus.
Chelsea came from behind to beat Crystal Palace 3-1 thanks to added time goals from Conor Gallagher and Enzo Fernandez.
Juventus will not play in Europe next season after being banned over breaches of UEFA's Club Licensing and Financial Fair Play rules.
'I was there among you 60 years ago in those stands. I asked you for help, now we need that final step.'
Juventus have been deducted 15 points for the current season by an Italian soccer court investigating its transfer dealings.
Mouth-watering matches lined up as PSG to face Bayern and Barcelona in Champions League opening stage.
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.
A first-half strike from Pedri gave Barcelona a 1-0 win over Villareal to extend their lead over Real Madrid at the top of LaLiga to 11 points
Real Madrid's Rodrygo struck twice and Jude Bellingham was also on target as the visitors enjoyed a 3-0 win at lowly Cadiz.
Villarreal fought back to shock Barcelona 3-2 on Sunday, handing the LaLiga champions their first league defeat since late December.
IMAGES from soccer matches played across Europe on Sunday.
Champions Real Madrid earned a 2-0 win in a feisty LaLiga encounter at Athletic Bilbao on Sunday to ensure they stayed in the hunt for the LaLiga title with leaders Barcelona.
Ronaldo has one year remaining on his contract at Juventus but there has been a flurry of media speculation that he could be leaving
Cristiano Ronaldo scored, but Al Nassr lost what could be his last-ever game for the club by 3-2 to Al Fateh on Monday in the Saudi Pro League. Following the match, the football icon hinted at an exit from the Saudi club, which he joined from Manchester United in 2023.
Images from the Europa League semi-final first leg matches on Thursday.
Lukaku was subjected to abuse during the first leg at Juventus "before, during, and after the penalty" he scored to earn Inter a 1-1 draw, the player's representatives said.
Lewandowski strike gives Barcelona 1-0 win over Alaves
Bournemouth defender Dean Huijsen will join Real Madrid from June 1 after signing a deal with the Spanish side until 2030.
Leaders Barcelona played out a second straight 0-0 draw in LaLiga after mid-table Getafe battled for a home point in a hard-fought game on Sunday.
