The 25-year-old has been in superlative form in the Premier League as well as in Europe this past campaign; netting 44 goals in all competitions the Reds were involved.
A total of four group-stage games will be played at the Yekaterinburg's 35,000-seater stadium, including Egypt taking on Uruguay on Friday.
He added: "We're trying to make him feel confident".
Final update has been provided on Mohamed Sala's injury ahead of Egypt's opening match against Uruguay.
Salah sustained a shoulder injury during Liverpool's 3-1 defeat to Real Madrid in the Champions League final last month.
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Barcelona forward Luis Suarez, a former player at Salah's club Liverpool, was named in the starting lineup for Uruguay in attack along with Paris Saint-Germain striker Edinson Cavani.
When the Egyptian national team were getting off their coach, Salah was approached by a fan.
"I promise you that I will do my best to be ready for the World Cup and to fulfill the Egyptian dream".
"He's very important and I don't think we should risk him in the first match".
And Cuper hinted on Thursday that it was the player who had the final decision whether to play.
Salah is regarded as a contender for the Ballon d Or for his spectacular debut season at Anfield, alongside Argentina s Lionel Messi, Portugal s Cristiano Ronaldo and Neymar of Brazil.
Thousands of supporters turned up to watch Egypt's final, late night training session before taking flight for Russian Federation, cheering wildly.