Livorno's relegation to Serie B was confirmed on Sunday as they slipped to a 1-0 home defeat to Torino.
Fernando Orsi's side entered the penultimate weekend of the season knowing only victory would keep them alive from the drop, but an Alessandro Rosina goal just before the break sealed their fate and secured the visitors' Serie A status.
The Amaranto fans, realising they were about to be relegated, staged a protest by throwing smoke bombs and other objects onto the pitch - temporarily halting play.
The Tuscans, promoted to the top-flight in 2004, began the season with Orsi as coach before replacing him with Giancarlo Camolese in October after a poor start. Club President Aldo Spinelli then reappointed Orsi last month as the club's form failed to improve but he has not been able to execute a great escape.
The final day of the season will confirm the other two sides who will be relegated. With Cagliari and Reggina securing their survival with wins today, three other sides will be hoping to avoid the drop.
Livorno can take their Tuscan rivals Empoli with them to Serie B as Gigi Cagni's side must beat Livorno at home and hope that Catania lose and Parma don't win their matches.
Catania and Parma are also at home next Sunday, but both will have to take on title-chasing sides. A win for Catania against second-placed Roma will guarentee safety, while Parma need to beat leaders Inter and hope Catania are defeated.