The 22-year-old proved to be one of the star performers at this summer's World Cup, with his form helping Netherlands into the semi-finals of the competition.
Manchester United have been strongly linked with a move and now Van Geel has added fuel to the fire by admitting that the centre-back could depart Holland.
"Stefan is a player who came through our youth academy and played in the first team for five years," Van Geel told De Telegraaf.
"He played an amazing World Cup and his contract is due to expire in one year. If the right club comes along and puts in a good offer, we will definitely look at it."
Lazio are also believed to be interested.