And what do these four players share in common? The answer of what Lionel Messi, CristianoRonaldo, Mohamed Salah and Kylian Mbappe share in common is the 2018 Ballon d'Or nomination.
Maurizio Sarri who is the handler of Italian champions Juventus has explained that CristianoRonaldo is not currently in his physical best for the Turin based side.
"I think he is facing the opportunity to take over from Lionel Messi andCristianoRonaldo to be the best player in the world, and he has time to do it."
"Nevertheless, CristianoRonaldo would be too old to play for Bayern Munich," Hainer said as quoted by Goal. Ronaldo, who is widely considered as one of the best players in the world, turned 35 years earlier this week.
Juventus forward, CristianoRonaldo, has said his team's first defeat of the season, came at the best possible time. Ronaldo gave his team the lead in a Champions League clash against former club Manchester United on Wednesday.
"May this short vacation break allow us all to make the best decisions for the future and come back stronger and more committed than ever," Ronaldo wrote.
CristianoRonaldo has expressed his doubts over the credibility of the Ballon d'Or and FIFA the Best awards after arch-rival Lionel Messi claimed both accolades.
He said: 'Everyone says you are the best in the world and you are playing badly. Show me you are the best.' "Cristiano took it. Ronaldo could score a hat-trick but talk about the one he missed," Adebayor said.
AC Milan star Rafael Leao acknowledges that he lacks the "selfish" streak of CristianoRonaldo, but the Portugal international is determined to ascend to the ranks of the world's best.