Mackay is willing to wait up until the last day to clinch the best deals.
"With the targets we want invariably there is also competition or clubs don't want to sell," said Mackay.
"We signed five in the last week of the window last year and we have brought in around 25 players to the club over the last two years, so we are well versed in the mechanics of how this works and the patience you sometimes have to have.
"Sometimes things happen quickly, like the Steven Caulker deal, other times it can be more protracted.
"We have some plates spinning at the moment, if it will take until September 2, then that is what it will take."
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