The Belgian is happy to move to Spurs even though they will not play in Europe's premier competition, but admits his future is unlikely to resolved before the end of the month
The highly-rated 25-year-old has long been linked with a move to north London, with Arsenal also thought to have previously been interested.
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He told Belgian newspaper Het Nieuwesblad: “I never said that I will only leave Ajax for Tottenham. I only said that they are my preferred option.
"I have a good feeling with the club and that matters to me. They have already invited me and want to wrap this up shortly.
“Tottenham missing out on the Champions League doesn’t play a role in my decision, but it could have consequences for their transfer budget.
"They’ve told me that I’m their only option and that’s a big compliment."
The centre-back also stressed that, while he would prefer a move during pre-season, a decision on his future will not be made before the end of the month.
He added: “The transfer talk doesn’t really affect me. I didn’t expect that I’d feel hardly any stress. If the move doesn’t happen now, I’ll stay at Ajax for another season, and can then leave on a free transfer.
"The chance that we will know more in the next 10 days is rather small. I just want to start pre-season at my new team."