Milan have announced the diagnosis for defender Mattia Caldara, who has a lesion of the Achilles tendon and muscle-tendon junction.
The former Atalanta full-back is expected to be out for at least three months.
A statement from the club confirmed the full diagnosis of a partial lesion of the Achilles tendon in his right leg.
There is also a lesion of the muscle-tendon junction of the gastrocnemius muscle.
The player must remain with a cast on his right leg for three weeks, during which he will have further tests and specialist consultations.