Viviano had only just completed his transfer to the Nerazzurri after a blind auction resolved the co-ownership deal with Bologna.
It was announced this evening that Viviano has suffered a devastating injury during pre-season training.
"Viviano underwent tests with Professor Franco Combi, medical director at F.C. Internazionale.
"The tests showed the complete lesion of the anterior cruciate ligament in his left knee.
"Over the next few days the necessary surgery will be planned out."