Swansea have received no bids for any of their players during the summer, according to boss Michael Laudrup. Ashley Williams has been linked with a move away from the Liberty Stadium, with Arsenal thought to be admirers.
"I can control what I'm doing but of course I can't control what others are thinking," he said.
"I've always said if someone really wants to leave for a certain reason, then it's very difficult to keep a player.
"We saw that last year with Joe [Allen] to Liverpool and Scott [Sinclair] to Man City and Danny [Graham].
"You can't really keep players against their will because they want to leave."
Laudrup said there was a cut-off point where the club will not sell if an offer is made too close to the transfer deadline, giving them no time to sign a replacement.
"It has to be reasonable in the sense that it needs to give us time to find a replacement," Laudrup added.
"So you can't come on the 30 August and say 'I'm leaving' or 'we want to buy this and that player' because then it won't be possible.
"I can't tell you exactly what date is the deadline if someone wants some of our players.
"But it's definitely not the 25th, the 27th, the 29th or 31st [of August]."