Cristiano Ronaldo yelled at his manager, Calciomercato reported, and there's a bit of a backstory to it. It was summer 2014 when Antonio Conte, then Juventus' manager, announced that he would no longer lead the club on the field. Fans were shocked, considering that he had brought Juventus back to where it belonged after seasons of disappointment.

The club's decision on Conte's successor was no less of a surprise; Massimilano Allegri, whom Juve fans believed not the best fit for the title challenger. Well, his only major trophy was the 2010/11 Scudetto with AC Milan, after all.

Although many were skeptical upon his appointment, Allegri kept his cool and promised the best to Juventini all over the world.

That day forward, he's led Juventus to win four consecutive Scudetti, four consecutive Coppa Italia, two Supercoppa Italiana, and two times reached the UCL finals (in which both ended in defeat).

Juventus' Dream in UCL

Achievement-wise, Allegri deserves all the praise as one of the club's greatest managers of all time. However, both the management and fans ask for more. He's deemed to have failed them in providing a UCL trophy, which the club's been dreaming of since their last victory back in 1995/96.

In fact, this dream had driven the club's president, Andrea Agnelli, to invest heavily in bringing Cristiano Ronaldo to Turin.

He just got crowned as the most-followed celeb on Instagram.

This investment gives even more pressure to Allegri. It's now or never.

Cristiano Ronaldo's Frustration

Therefore, when Juventus were trashed by Atletico Madrid in UCL's big sixteen, fans bombarded Allegri with criticism and asked him to step down. They blamed Allegri for playing safe and refusing to initiate any attacking tactics on the field.

When the same tactic was implemented in the match vs Napoli, especially after Miralem Pjanic's send-off, it's clear that it disappointed some people, including the club's superstar Cristiano Ronaldo.

Ronaldo, who's been spending most of his career attacking-minded giants like Real Madrid and (then) Manchester United, felt that Allegri should instruct his players to play more attacking football, especially that they looked to lose their advantage after Napoli scored a goal.

Cristiano Ronaldo had the right to be furious at Allegri's unwillingness to play attacking football. He's one of leading goalscorers of all time, thus him asking his friends to support his attacking minded movement would be legit. According to Daily Star Sport, he shouted, "Mister!" to Allegri who was standing on the sideline at the 65th minute, indicating that he needed more support in attack.

Many people believe that the incident perfectly portrays Ronaldo's frustration with Allegri's balanced approach. After all, how would you expect someone who naturally scores 30-40 goals a season to go and help with the defense?

If this situation continues any longer, it's not impossible to see either one of them leaving the club at the end of the season.

Having spent a big sum on signing Ronaldo, including paying a hefty sum of his annual salary, it's rational for Andrea Agnelli to prefer keeping him on board rather than persuading Allegri to stay. In fact, rumors say that Juve management has started the search for Allegri's successor, with several names have been linked with the Bianconeri in the past weeks, including the club's legend Zinedine Zidane, who holds the record of three-time back-to-back UCL victories.