Sergej Milinkovic-Savic has been identified as a summer target for Manchester United, Real Madrid and Paris Saint-Germain.
Lazio sporting director Igli Tare has said it will take "much more" than €90 million ($110.6 million) to sell Milinkovic-Savic.
Milinkovic-Savic is considered one of the world's best young box-to-box midfielders.
"We know where we want to get and I don't like to talk about it now because we're in the midst of a battle for many important objectives and there is a time and a place to talk about things," he told Sportitalia.
Asked whether €80-90 million was a fair valuation, he said: "Yes -- even much more. There have already been offers in this region last summer and we didn't consider them.
"There are major European clubs interested in Milinkovic-Savic, but we don't have anything definite on the table."