Juventus posted pictures and videos of Buffon signing autographs for fans outside the club's training facility before he went inside for the tests.
Adrien Rabiot was unveiled as a Juventus player on Tuesday at a press conference.
Atalanta drew 1-1 at Italian champion Juventus on Sunday to move into third place in the Italian league, leapfrogging Inter Milan after the Nerazzurri lost 4-1 at Napoli.
With this win, Ronaldo has now won the domestic player of the year award in England, Spain, and Italy.
Allegri's contract was due to expire at the end of next season and he indicated he would remain in place when Juventus clinched a record-extending eighth straight Serie A title last month.
Ronaldo became the first player in history to win league titles in the English Premier League (with United), the Spanish league (Madrid) and Serie A (Juventus).
It is the first time since 2010 that Ronaldo has failed to reach the last four, having won the competition the last three years in a row with Madrid.
Kean, who was the victim of racist abuse during the week, came off the bench to score as Juventus came from behind to beat AC Milan 2-1.
Jose Mourinho praised Cristiano Ronaldo and Lionel Messi and said had there been only one of them at a given time, he could have bagged 10 Golden Boots.
It was Juve's first league defeat since April but the Bianconeri still have a commanding advantage at the top of the table. They are 18 points ahead of second-placed Napoli.
The clash between Barcelona and United brings in plenty of history as it was the Spanish giants that defeated United in the 2011 finals at Wembley.
Cristiano Ronaldo scored a hat trick against the normally resilient Spanish side to send Juventus into the Champions League quarterfinals with a 3-0 win on Tuesday.
Kean, who received a standing ovation when he was replaced late, also won a penalty which was converted by Emre Can.
Modric, who replaced Ronaldo as the winner of the world's best player award, felt that things would be different for Madrid if the Portugal forward hadn't left to join Juventus last year.
2 red cards were handed and a late penalty missed by Insigne saw the high dramatic clash ending with Juventus taking a 16-point lead in the Italian league.
fter Atletico defender Jose Maria Gimenez scored the first goal late in a 2-0 win on Wednesday, Simeone turned to his team's fans and made the gesture.
Diego Simeone has said he regretted the way he celebrated his team's first goal scored in Atletico Madrid's 2-0 win over Juventus in the Champions League.
Ronaldo was loudly booed when his name was announced before the match, and he drew even louder jeers from the Atletico crowd when he prompted the game to be interrupted.
Atletico coach Diego Simeone will be able to call on Antoine Griezmann, Diego Costa and Alvaro Morata when his team hosts Juventus in the first leg of the last 16 on Wednesday.
The former Real Madrid forward has already developed a good partnership with Mandzukic and it now appears as though his understanding with Dybala is developing swiftly, too.
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