Napoli midfielder Giandomenico Mesto will be out of action until next year after undergoing knee surgery, the Serie A club have confirmed.
The three-time Italy international hurt his right knee in Saturday's 2-1 victory over Catania and went under the knife on Monday to reconstruct a torn anterior cruciate ligament.
A statement from Napoli read: "The surgery went well and the expected recovery period for Mesto will be around four months."
In his eight appearances this term, former Genoa player Mesto had helped Napoli take a share of second place with reigning champions Juventus and he could return to the Azzurri squad before March.
Napoli next face Marseille at the Stadio San Paolo in the Champions League on Wednesday night.