De Jong was asked about the speculation after their Champions League qualifier against Sturm Graz. Ajax won 2-0.
He remains none the wiser over the possibility of a move.
"The talks about a possible transfer are still going on. I see all the newsflashes, everybody tells me stuff," he told Voetbal International.
"At first I thought it was kind of funny, but after a while I was thinking 'does this ever stop?' But besides all that, my summer was quite normal."