The centre-back has missed almost a month of action with a thigh injury sustained in the victory at Bologna.
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But Romagnoli is now in line to play in Saturday’s home Serie A game against Chievo after Milan confirmed he had completed a full session with his team-mates.
Milan have still managed to pick up seven points from a possible nine in the 22-year-old’s absence.
However, Ignazio Abate – who has started the last three games - missed training with an eye injury and will reportedly miss the game, with Mattia De Sciglio set to replace him.
