The agent of Sao Paulo midfielder Casemiro admits Genoa have made an offer for the Brazilian.
Sao Paulo have put Casemiro up for sale this month and Lazio president Claudio Lotito has expressed interest this week.
Agent Joseph Lee told Lalaziosiamonoi.it: "At the moment I am not in negotiations with Lazio, while I know that Genoa has submitted a bid a few days ago.
"However, it was an offer that was deemed insufficient by Sao Paulo.
"A co-ownership between Lazio and Genoa? There was this possibility, but from what I know this has stalled."