The highly-rated Zivkovic has established himself at Groningen this season, with the 17-year-old attacker scoring 5 goals in 20 Eredivisie appearances.
Ajax director of football Marc Overmars last week confirmed that the defending champions are interested in acquiring Zivkovic's services.
"Negotiations are ongoing, so I cannot say too much about them," Nijland told Algemeen Dagblad.
"We wanted to extend his contract, but Richairo has shown to have ambitions. He wants to take a higher step. That's his right.
"But there is certainly no green light yet. After the weekend, we will continue talking. The talks with Ajax have been very enjoyable."
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