Nice Front Office
Balotelli hasn't played since early December after falling out with Patrick Vieira.
Former Arsenal teammates Patrick Vieira and Thierry Henry were scheduled to meet as mangers.
Patrick Vieira had agreed to a three-year contract.
Dortmund triggered a €3 million release clause in Lucien Favre's contract with Nice.
Mario Balotelli has signed a one-year deal to remain with Nice.