Sydney FC chief executive George Perry says the A-League club will only release Socceroos David Carney and Mark Milligan to overseas clubs if the transfer price is right.
Both players are rumoured to want out of Sydney FC after attracting interest from European sides following their performances for the Socceroos in the Asian Cup.
English Premier League side Wigan are reportedly interested in signing Carney and Milligan is believed to have recently trialled with French club Metz.
Perry said Sydney FC's stance wasn't about preventing the players from furthering their careers abroad, but about getting what they deserved for two players under contract with A-League's inaugural champions.
"The reality is that both players do have a contract with Sydney FC and they are both valuable assets and we want to make sure that we get a reasonable return on those assets for the club," Perry told Sydney radio station 2KY.
"It's about making sure that we get the right price for the transfer fee."
On Monday, Carney was booked to fly to England to hold talks with a club believed to be Wigan before Sydney FC stepped in and prevented the move by the left-footed midfielder.
"David Carney wants to go and have discussions with a club overseas and we sought some assurances from Dave before he goes," Perry said.
"There are some conditions in his contract that we'd like him to look at and then he's free to go."
This follows Milligan heading off to trial for Metz just a few days earlier.
Both players were given an extra week off after their torrid campaign in the searing Asian Cup conditions.
"Mark Milligan will return to the team on Thursday having been away for a week or so and we've had some pretty serious discussions with his agent over the past 48-24 hours and we also chatted with Mark last night and will have more discussions with him when he returns," Perry said.
"We've always said to Mark and Dave that if an offer came through and if it was in everyone's best interests then we wouldn't stand in the way and we've always said that and will always say that whether it's David Carney or any other player.
"But the reality is that we're only three-and-a-half weeks away from the kickoff of the A-League season and our pre-season has been untidy because of a number of matters."
Sydney FC were belted 3-0 by the Central Coast Mariners in the Pre-Season Cup at Canberra on Sunday, leaving them winless in the competition.
They were hammered 3-0 in the second round by the A-League's newest side, Wellington Phoenix.
Perry said the club was also hoping to resolve its ongoing marquee player saga by the end of the week.
"We're still in discussion with a couple of players and we'd like to have a resolution to it by the end of this week," he said.
Sydney FC are still in talks with Socceroos striker John Aloisi but Perry said the chances of snaring the World Cup hero appeared unlikely.
"We're discussing John's situation with his agent but that appears unlikely."
There was some good news for Sydney FC with the signing Young Socceroos striker Ben Vidaic.
The 19-year-old has scored five goals in eight matches for the Joeys (Under 17s) and the Young Socceroos (Under 20s) over the past two years and made substitute appearances in Sydney FC's Pre-Season Cup games against Queensland Roar, Wellington Phoenix and Central Coast