Salah faces a battle to be fit in time for the tournament after damaging his shoulder ligaments during the Champions League final last month, although he is expected to feature in at least two of his side's group games.
"I wish Salah the best and hope he returns," Hazard told ON Sport.
"I will support Egypt in the World Cup for him. Egypt are so different without Salah but they still performed well with compact lines. Their playing style is close to that of Tunisia.
"I spoke with Salah after the Champions League final and sent him a message, as I said he is my friend and I want to see him in the World Cup."
Egypt's opening match at this summer's World Cup sees them take on Uruguay on June 15.