 After not making any appearances for Roma in the 2014–15 season, Borriello sealed a permanent return to Genoa for the third time on the final day of the January 2015 transfer window.On 3 August 2016, Borriello joined newly promoted Cagliari on a free transfer.He scored four goals on his competitive debut for the club in a 5–1 2016–17 Coppa Italia win over Serie B side SPAL on 15 August.