Virgil van Dijk claims he knows nothing of interest from English clubs and is keen to prove himself in the Champions League with Celtic.
QPR loanee Tom Carroll wants to "make it at Tottenham" but is prepared to consider all of his options at the end of the season.
The 46-year-old, who took charge at the Stadion De Goffert in July 2011, was under contract until the end of this season but will now stay in Nijmegen for a further 12 months.
"NEC are developing in many areas," Pastoor said.
"The ambitions of the club, the atmosphere in Nijmegen and the further professionalisation of the club - I can help contribute to all of that."
NEC are seventh in the Eredivisie standings and in contention for a Europa League play-off place.