Sassuolo striker Simone Zaza is set to pen new terms this month.
Zaza has been linked with a return to Juventus in January.
"The matter will be sorted before Christmas," Christian Maifredi told Tuttomercatoweb.
"There are no problems with the club. He's leaving his mark in Sassuolo.
"There are no meetings set, and right now Simone is concentrated on this important phase of his season.
"Sassuolo are doing well, let's hope they keep on like this and that Zaza finds his way back to goal, which he's been missing for a few rounds."
