On 24 May 2011, Milan exercised its option to purchase Amelia for €3.5 million on a three-year contract, despite Amelia only making a handful of appearances and being second-choice to Christian Abbiati all season. Amelia made his debut in the 2011–12 season in Serie A, on 28 November 2011 against Chievo, replacing Abbiati, who suffered a shoulder injury. Amelia went on to make 14 appearances for Milan that season.