The 22-year-old was strongly linked with Manchester United in the summer, but he remained at PSV despite the interest.
However, Chiel Dekker has revealed that the £15m-rated defensive midfielder could be available next summer.
"My client could leave in January? Absolutely not. There's nothing in that. We are only in October - the only thing I can say is to call me back in May," he told Calciomercato.
AC Milan are also thought to be interested in the Dutchman.