Pardew has called for the window to end before the season officially starts in future to create a level playing field.
He told BBC Newcastle: "It's unsettling and unsavoury and it needs to be eliminated. It's really not fair. The transfer window should be shut before we kick a ball and that way everyone knows where they are.
"If you can't do your business in the summer, then I don't know why because there is plenty of time.
"The top three or four teams have a massive advantage. They can even play with you and say they are coming for one of your players but then not actually [do so]. I'm sure that goes on."
The Magpies continue to be linked with the signature of French international full-back Mathieu Debuchy in one of the the summer's longest-running transfer stories.