 In August 2009, he was loaned to Frosinone for €200,000.In July 2010, Siena signed Bolzoni on loan for €400,000 with an option to acquire 50% of his economic rights, fact that occurred on 22 June 2011, for €1,050,000.On 23 June 2012 Siena bought him outright for another €425,000.