The tall centre-back is only 21 years old, but has already notched up one goal and 25 top flight appearances since joining Crvena Zvezda in January 2012.
He also has four caps for Serbia at senior level.
Maksimovic had previously been linked with Juventus, but is effectively a replacement for Angelo Ogbonna, who left Toro in order to join the Bianconeri.
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- Angelo Ogbonna