Genoa, 16th in Serie A, confirmed the injury on their website without specifying the time of his return (http://genoacfc.it/).
"Unfortunately the diagnosis confirms that the break will be for 40 days," the 27-year old Pavoletti said.
Genoa's Argentine defender Cristian Ansaldi will also miss Sunday's game against sixth-placed Milan with a hamstring injury.
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(Reporting by Marianna Ciabach-Malinowska in Gdynia)
