Federico Gatti broke his left leg in Saturday's 1-0 win over Geno and Juventus will be without the Italy centre-back for about a month, the Old Lady said Monday.
X-rays Monday "revealed the presence of a compound fracture of the diaphysis of the fibula", said the Turin giants, who are vying for a Champions League place in fifth spot.
New coach Igor Tudor thus loses a key part of his defence.
Ex Frosinone defender Gatti, 26, has six Italy caps.
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