Juve lost 3-0 at home to AC Milan on Sunday, leaving Ronaldo and his teammates fifth in Serie A and a point off the top four with just three games remaining.
Brahim Diaz put the visitors in front on the stroke of half-time. Franck Kessie then missed a penalty for Milan just before the hour mark before Zlatan Ibrahimovic limped off with a knee injury.
However, Ante Rebic (78) and Fikayo Tomori (82) made sure of the win as Stefano Pioli's side moved up to third spot.
Tomori's goal for AC Milan vs Juventus. What a header. pic.twitter.com/P2ZwiI5Zip- Felix (@cfc_felix_) May 9, 2021
It was a deeply frustrating night for Juve who only managed one shot on target during the 90 minutes.
Juventus travel to eighth-place Sassuolo on Wednesday, before hosting champions Inter Milan on Saturday. They end their league campaign with a trip to mid-table Bologna.
Speculation over Ronaldo's future continues. calciomercato.it claim Ronaldo has his heart set on a return to Manchester United and is 'ready to do anything it takes to get back to wearing the Red Devils shirt' this summer.
Ronaldo knowing he promised Juventus the Champions League but now taking them to Europa League. pic.twitter.com/HPURAY1Qxb- BeksFCB (@Joshua_Ubeku) May 9, 2021
But Italian journalist Claudio Raimondi says Ronaldo wants to head back to former club Sporting Lisbon when his Juve contract expires next year.
"Ronaldo has an idea for his future that we are going to reveal here first hand," Raimondi told Italian TV Sport Mediaset's 'Pressing' programme.
"He wants to end his cycle at Juventus and then play for two years at Sporting.
#JuventusMilan 0-3 FT- Tancredi Palmeri (@tancredipalmeri) May 9, 2021
No. Not this match.
Juventus game is over.
Their most embarrassing performance in Serie A in a decade is the mirror of how the club has sunk in 2021.
The wave of shame has carried away even Cristiano Ronaldo anchorage.
The ship has sunk.
"Cristiano has no intention of leaving Juventus, he wants to honour the contract, which ends in 2022.
"There is no chance of a return to Spain and Real Madrid, whereas Manchester United have no financial strength for a move.
"There are no conditions for Ronaldo to leave Juventus, especially for personal reasons and the connection with his sponsors."
Ronaldo was honoured by Sporting in September last year when the Portuguese side renamed their academy after the 36-year-old.
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