Despite speculation linking Ashley Williams with a move to Arsenal, Laudrup says there have been no bids for any of his players - though he admits that could change before the deadline.
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"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 is hoping outgoings are not forced on him towards the end of the transfer window - like last season when Danny Graham left for Sunderland on deadline day.
"It has to be reasonable in the sense that it needs to give us time to find a replacement," he added.
"So you can't come on August 30 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]."