Reports in England have intensified in recent days with the Daily Mail going as far as claiming a move to Anfield could be imminent.
De Boer has already suggested that it would take a 'super club' to land him, but now he has insisted that only huge money would be enough.
"We know how important Luis is for Ajax," he told De Telegraaf.
"Only when an absurd amount is on the table should we let him go."
When quizzed about how much it might take, it was noted that Edin Dzeko went for around 30million euros, and he hinted that would be about the price they are looking for.
"That is a tidy sum," he said.
"Luis feels good and is training well, I don't think he will leave at any cost."
Liverpool are reported to be looking at a deal worth 15million euros, possibly with Ryan Babel included but that is obviously still some way short of Ajax's potential valuation.
Suarez has two-and-a-half years left on his current deal, but has previously been quoted this month as saying he is ready to leave.