Swansea have received no bids for any of their players during the summer, according to manager Michael Laudrup.
Ashley Williams has been linked with a move away from the Liberty Stadium, with Arsenal thought to be admirers.
Although Laudrup confirmed he had received no bids so far, he admitted that could change before the deadline on 2 September.
"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.
Graham was sold to Sunderland on deadline day in January, meaning Laudrup had no time to sign a new striker, and he would want to avoid a similar situation ahead of the new season.
"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]."
Defenders Kyle Bartley and Alan Tate have gone out on loan while Dutch midfielder Kemy Agustien is expected to move to Brighton & Hove Albion.
And Laudrup expects other players, who do not figure in his first-team plans for the coming season, will also be leaving the club.
"All players want to play football, not only training, but play games as well," he said.
"We just hope that the rest of those players will find a destination in a short time so they can play games as well."