The 19-year-old has been linked with a host of Premier League clubs including Liverpool in recent months.
“I’m not ready yet for a transfer. I feel like I only just arrived here,” he told voetbalmagazine.nl.
“The step to a bigger club would be too big right now. I’m simply not ready yet.
“I’ve been here for only two years and am very happy at this club. Things are going pretty well at the moment and I want to keep that form going.”
