He saw his brother Luuk spend the second half of the 2013/14 campaign on loan at Newcastle.
De Jong told Holland's Soccer News: "I really do not know what I'll do next season. I have spoken with the club but nothing is sorted.
"Also with Newcastle United, where my brother played last time, they have had a little contact with my agent.
"There was contact before, but it's nothing concrete.
"Newcastle is a great club."
Were De Jong to make a move to England, it appears unlikely that he will be joined by Luuk, with Newcastle having passed on the option of making his loan deal permanent.
"I'm going next week to talk to Ajax, then I'll see."
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