Salah won last season's England's Players' Player of the Year Award and the Football Writers' Association's Footballer of the Year Award.
For Modric, he enjoyed a fantastic season, winning the Champions League alongside Ronaldo, as well as finishing runner-up at the World Cup and claiming the Golden Ball.
Ronaldo, now with Juventus, has won the UEFA award each time Madrid has been European champion since the vote was introduced in 2011.
Luka Modric helped his nation reach the final of the 2018 World Cup in Russian Federation where he won the Golden ball award. He also had 26 goals in 27 La Liga matches and four World Cup goals. In 2012, Andres Iniesta won the prize weeks after helping Spain to a second straight European title although Barcelona was eliminated in the Champions League semifinals.
While this is the first nomination for both Modric and Salah, it would be the fourth time Ronaldo has picked up this award, if he goes on to win.
Cristiano Ronaldo, Lionel Messi and Mohamed Salah were nominated by UEFA as the strikers in the 2017-18 Champions League. The tournament in Russian Federation could prove to be Croatia's current golden generation last major global appearance, and Zlatko Dalić's side shocked fans across the globe by reaching the final.
The Egyptian had a stellar debut season on Merseyside, scoring 44 goals on his way to capturing the Premier League Golden Boot and PFA player of the year award. And Salah stood out for Liverpool at the Champions Cup.
The victor will be announced along with the Champions League group-stage draw on August 30.