Moshiri told a shareholders' meeting that Lukaku, 24, received the message from "a pilgrimage to Africa".
A representative for the player told BBC Sport: "Romelu's decision had nothing to do with voodoo."
The spokesperson added: "He distances himself from these beliefs and this statement and will now see what judicial steps can be taken in relation to them."
His representative added: "Romelu is very catholic and voodoo is not part of his life or his beliefs.
"He simply had no faith in Everton and no confidence in Mr Moshiri's project. That is why he did not want to sign on any condition.
"He wanted to make the next step in his career and wanted the security to be able to leave."