Their selection comes after voting from 25,000 professional footballers in 65 countries around the globe.
Almost 25,000 professional footballers from about 65 different countries voted for 55 players to select one goalkeeper, four defenders, three midfielders and three forwards for the 2018 World XI, FIFA said.
There are five goalkeepers, 20 defenders, 15 midfielders and 15 forwards on the list.
Salah, 26, who played the best football season ever played by an Egyptian, and his teammate Sadio Mane of Senegal, are the only two African nominees on the 55-names list.
World champion France had eight players, one less than former holder Spain, in global players' association FIFPro's 55-name shortlist for its World XI of 2018 award. Surprisingly there is no Gareth Bale, who finished last season at a high level and scored in the Champions League final.
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Steven Gerrard was named in all three of these years, with striker Fernando Torres named in both 2008 and 2009.
Sergio Ramos of Real Madrid has appeared eight times overall, and in each of the World elevens of the past seven years.
Mohamed Salah, Cristiano Ronaldo and Lionel Messi are among the contenders in the reckoning to feature in FIFPro and FIFA's World XI. Their impressive performances means the Spanish La Liga is usually dominant.
The 27-year-old played a key role in their third-place finish in Russian Federation, which led to speculation he could replace Cristiano Ronaldo at Real Madrid.
The other defenders with the most votes are Jordi Alba, Dani Alves, Dani Carvajal, Virgil van Dijk, Diego Godin, Mats Hummels, Joshua Kimmich, Marcelo, Yerry Mina, Gerard Pique, Thiago Silva, Kieran Trippier, Raphael Varane, Sime Vrsaljko and Kyle Walker.