The 28-year-old has been one of the shining lights in a dismal campaign for Sunderland so far.
Furio Valcareggi told Tuttojuve.com: "He looks great in England with Sunderland and has no problems related to acclimatisation - absolutely no problems of any kind.
"He's been in England for three months. We do not even have time to talk already about his possible return [to Juventus]."
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