The Brazilian midfielder signed from Serie A rivals AS Roma for 28 million euros.
United manager Erik Ten Hag has come under pressure already after two defeats in their opening three games and Ronaldo said he should lean on his former United teammate Ruud van Nistelrooy, who was hired as an assistant coach.
Juventus have signed Serbia winger Milos Krasic from CSKA Moscow on a four-year contract for a fee of 15 million euros ($19.07 million), the Italian first division club said on their website (www.juventus.com) Saturday.
Juventus beat a disorganised AC Milan 4-2 in an enthralling Serie A encounter on Sunday to go clear in second place. Striker Amauri scored twice to put Juve six points behind leaders Inter Milan, who earlier defeated bottom side Chievo 4-2, while Milan now trail their city rivals by nine after 16 matches.
Pirlo started his first season in charge of a senior side looking to make it 10 successive Serie A titles for Juve, but the rookie coach struggled.
Juventus moved one win away from the Serie A title after they beat Parma 2-0 while AC Milan were held 2-2 at Lecce.
Dani Alves appeared to have won the game for Juventus when he headed them in front in the 83rd minute but Remo Freuler pounced to equalise six minutes later as he punished some sloppy defending.
Cristiano Ronaldo became the first player to score 400 goals in Europe's top five leagues as Juventus dropped points for the first time this season following a 1-1 Serie A draw with Genoa on Saturday. The Portuguese striker's fifth league goal for Juve carried him to the milestone, adding to his 84 strikes for Manchester United in the Premier League and 311 for Real Madrid in La Liga.
Juventus came from behind to snatch a dramatic 3-2 win at Chievo as Cristiano Ronaldo made his debut for the Turin side on Saturday, although the Portuguese was not among the scorers in his first Serie A match.
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.
Napoli forward Lukaku, who has battled to regain match fitness after joining the club in late August, delivered an impressive performance with one goal and two assists.
Juventus coach Massimiliano Allegri has confirmed that the Serie A leaders are interesting in signing Dutch midfielder Wesley Sneijder from Galatasaray.
Claudio Ranieri has been sacked as Juventus coach after a poor run of results and youth team boss Ciro Ferrara has taken over, the club said on Monday. The Turin side are a point above fourth-placed Fiorentina with two matches left and are in danger of slipping out of an automatic Champions League berth after a run of seven Serie A games without a win.
Bayern Munich winger Serge Gnabry has been ruled out of Wednesday's Champions League quarter-final first leg against Paris St Germain after testing positive for COVID-19 while midfielder Marc Roca will miss the game due to injury.
A summary of Saturday's action in La Liga, Serie A and Bundesliga.
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.
The relegation of Juventus to Serie B for their role in a match-fixing scandal was confirmed by an Italian soccer appeal court on Tuesday but Lazio and Fiorentina received a reprieve and will stay in Serie A.
Ivan Toney, once Brentford's lynchpin in attack, has moved to Al-Ahli for 40 million pounds ($52.50 million).
Cristiano Ronaldo capped his first full Saudi Pro League season in style as he broke the record for the most goals scored in one campaign.
champions Inter Milan are now three points clear at the top of Serie A with 17 points from seven games courtesy of their 2-1 win over Napoli.
Juventus beat Cagliari 3-1 away on Thursday to end a three-match winless streak and move four points clear at the top of Serie A.
News of all that's transpired on and off the football field.
Lazio regional court had decided not to hear appeals by former Juve general manager Luciano Moggi or ex-chief executive Antonio Giraudo against their bans and fines in the case.
The 41-year-old has made 640 appearances in Serie A, within striking distance of the 647-game record of AC Milan defender Paolo Maldini. Buffon began his career at Parma before moving to the Turin club in 2001.
Gianluigi Buffon has decided to stay at Juventus despite the club being demoted to Serie B.
Juventus clinched their sixth successive Serie A title, and completed a third league and cup double in a row, when they beat relegation-threatened Crotone 3-0 on Sunday.
Juventus will create a memorial at their new stadium to remember the victims of Heysel, their club president said on the 25th anniversary of the disaster.
Juventus raced into a 2-0 halftime lead after Napoli goalkeeper Alex Meret was sent off in the 25th minute. The visitors then had Pjanic dismissed and Napoli's Jose Callejon pulled one back before Insigne let the Turin side off the hook.
Former Arsenal, Real Madrid and Chelsea striker Nicolas Anelka has joined Juventus on a five-month deal from China's Shanghai Shenhua, the Italian club said on Saturday.
Juventus midfielder Arturo Vidal was dropped by coach Antonio Conte on Sunday and is also likely to be fined after returning late from a World Cup qualifier with Chile.
Carlos Tevez scored two early goals for Juventus before the Serie A leaders squandered the lead in a 2-2 draw at Verona on Sunday.
Juventus extended their lead at the top of Serie A with an embarrassingly easy win over Atalanta, who trailed by three goals and were reduced to 10 men after barely more than half an hour on Sunday.
Morocco defender Mehdi Benatia has arrived in Turin for a medical as he looks to complete a switch from Bayern Munich to Juventus, the Serie A champions said on Thursday. "Having touched down in Turin this morning... Medhi Benatia made his way immediately to J-Medical, where he is carrying out routine tests ahead of a proposed move to Juventus," the Italian club said in a statement on Thursday.
France midfielder Paul Pogba is to undergo a medical at Manchester United ahead of a transfer from Serie A champions Juventus, the English Premier League club said on Sunday. United have been widely reported as being prepared to pay a world record fee of 120 million euros (101.78 million) for the 23-year-old who joined Juventus on a free transfer from the Old Trafford club in 2012. "Paul Pogba has been granted permission to have a medical in order to finalise his transfer from Juventus to Manchester United," said the statement.
