Damiao, who has also been linked with a move to Southampton, has reportedly been the subject of a verbal enquiry from Rafa Benitez's Napoli but Internacional are not in the mood to sell.
Moura told Lancenet: "We received an €18million (£15m) verbal offer from Napoli, according to the player's agent (Vinicius Prates).
"We don't accept that this is Leandro Damiao's value. We are certain he will play the 2014 World Cup with Brazil's national team.
"We have not had any talks about setting a value as we don't intend to sell the player."
He added: "We have sold Fred and Rodrigo Moledo. We don't need to sell Leandro Damiao and we won't accept any value for the player.
"The offer that was presented to us was lower than what he is worth."