The Serbia international joins Forest on a contract to 2029 and for an undisclosed fee.
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Forest football chief Ross Wilson said: “We are excited to welcome Nikola to Nottingham Forest today. He is a key part of our squad planning this summer and I know how enthusiastic he has been to join the club.
“We have long admired his performances with the Serbian national team, and in Serie A and European competitions for Fiorentina.
“We are delighted that he will bring his experience and qualities to Nottingham Forest.”