Zivkovic's agent, Daan Kramp, revealed: "His career is developing rapidly. He's proved to be great in the Eredivisie this season, scoring some very important goals.
"It is not surprising that several Dutch, English and Russian clubs are interested in Zivkovic. He's a tremendous talent who has been with Groningen since he was 13.
"This club has turned into his family, but in the case of worthy proposals the player is ready for a change."
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