Lazio president Claudio Lotito is ready to negotiate Aleksandar Kolarov's departure provided the right offer comes along.
The Serbia international is under contract for a further season with the Serie A outfit and is a reported target of Manchester City and Real Madrid.
"Kolarov is not a free agent," said Lotito. "If it was down to me, I would not sell him. But if he wants to leave, he needs to bring an offer from a team that grants a fair economic solution."
Reports in Italy claimed Lazio turned down a £12 million bid from Real Madrid earlier this month to sign the 24-year-old left back.
"Those that claim that I am asking €50 million for the player are mistaken," said Lotito. "I am ready to discuss a solution that takes into account the wishes of everyone involved.
"Kolarov is a good man and we have no intention to block his career growth but we have to bear in mind the needs of everyone involved. I am available to look at offers."
Kolarov has been a regular first-team player since 2007 when he joined Lazio from OFK Beograd. Manchester City boss Roberto Mancini is a big fan of the powerful Kolarov, who can also play in midfield.
Meanwhile, the Biancoceleste have signed Australia international Mark Bresciano on a two-year contract.
The 30-year-old midfielder joins on a free transfer having spent the past four seasons at Serie A club Palermo, for whom he scored one goal in 18 league appearances last season.
Bresciano, who was a member of the Socceroos' World Cup squad, is Lazio's first summer signing.