This decision comes after Petrovic was left out of Chelsea's Club World Cup squad, giving him and his agents time to sort out his future for next season.
Several Premier League teams are interested in signing Petrovic, including Leeds United, Juventus, Aston Villa, and Wolves.
Leeds United is looking for a new goalkeeper, as Ilian Meslier is expected to leave the club this summer.
Alongside Petrovic, the club is also considering other options, such as Michael Cooper from Sheffield United and Sam Johnstone from Wolves.