Lazio would be willing to part company with left-back Aleksandar Kolarov if their valuation of the player is met.
Kolarov is believed to be a target of Manchester City and Real Madrid in the close season despite having a season remaining on his existing deal at the Italian side.
And the Serie A outfit were quick to point out the Serbia international is still contracted to the club in light of the interest in the defender.
That could mean Kolarov's suitors face a tussle to secure his services, with Lazio president Claudio Lotitto saying: "Kolarov is not a free agent.
"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."
Kolarov has built an impressive reputation for himself since his move to the Stadio Olimpico in 2007, where he signed from Serbian side OFK Beograd.
The left-back can also play in midfield and City boss Roberto Mancini is said to be a big admirer of the powerful player.
Jose Mourinho is also believed to be keen on bolstering his defence by recruiting Kolarov and reports had suggested Real had already tabled a £12million bid.
Lotitto did not confirm an approach had been made but did reveal he would be willing to do business - so long as any transfer pleased all involved parties.
"Those that claim that I am asking 50million euros for the player are mistaken," he added.
"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."