The hard-tackling midfielder had been out of action for two months because of a problem with the sixth cranial nerve, one of the muscles which control the movement of the eye.
"Milan is pleased to announce that Rino Gattuso has been to see Professor Emilio Campos at the St Orsola hospital in Bologna," the club said in a statement.
"The doctor has reported notable progress and Gattuso has been given the all clear to get back training with the team."
"His symptoms have been improving and so he has gradually been intensifying his work load," team doctor Rodolfo Tavana said.
"We are still keeping a close eye on the player and over the next few days we will conduct further tests."
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