The 31-year-old forward was without a club after parting company with Serie B oufit Bari in the summer.
On Wednesday, Vignaroli linked up with the Roman club and he has now signed a one-year contract with an option for a further 12 months.
Copyright (c) PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms