The final World XI will be announced on Monday 24 September alongside The Best FIFA Men's Player and Coach, The Best FIFA Women's Player and Coach, The Best FIFA Goalkeeper, the FIFA Puskás Award, the FIFA Fan Award and the FIFA Fair Play Award for 2018.
All 55 players were selected by fellow professional footballers, as 25 000 players from 65 different countries voted for one goalkeeper, four defenders, three midfielders and three forwards. De Gea and Navas are on the list for the fourth time in a row while Buffon was named the No.1 goalkeeper a year ago.
His effect on Liverpool's defence should not be underestimated; he has improved their distribution from the back as well as their defensive solidity, helping the Reds reach the Champions League final.
The likes of Cristiano Ronaldo, Lionel Messi, Mohamed Salah and Luka Modric are among the big names on the list, but there were also some surprises.
Gareth Bale, Sergio Aguero and Alexis Sanchez have missed out on the shortlist for attackers in the FIFA FIFPro World 11.
Mohamed Salah was nominated to the final list after presenting spectacular performance on both club and global level last season with Liverpool and the Egyptian national team. Luka Modric, who won UEFA Player of the Year, is the stand-out among their nominations after taking Croatia to the World Cup final.
Samuel Eto'o [2005 & 2006] and Didier Drogba  are the only Africans to have made the World XI.