[4][5] On 25 June 2011, Viviano rejoined Inter Milan from Bologna after the Lega Serie A had announced the results of the co-ownership deals.

[11][12] Viviano would compete with Greek international Alexandros Tzorvas for a starting spot and squeezed Francesco Benussi out.

In a separate deal, the transfer fee would partially compensate for the signing of Cesare Bovo from Palermo to Genoa outright.

[18] After the departure of Rui Patrício, on 22 June 2018, Viviano was signed by Sporting CP from Italian side Sampdoria for a reported fee of €2 million.

[23] At the 2008 Olympics in Beijing, Italy reached the quarter-finals, where they suffered a 3–2 defeat to Belgium; during the match, Viviano was sent off in the 80th minute for a reactionary foul on Kevin Mirallas, after the latter had kicked the ball at him when play had stopped following Mousa Dembélé's goal, which took Belgium into the lead, and ultimately proved to be the match–winner.

[24] After receiving his first senior call-up on 6 August 2010, ahead of Italy's friendly against Ivory Coast on 10 August,[25] Viviano made his debut for Italy senior team on 7 September, during a UEFA Euro 2012 qualifying match, in a 5–0 victory against the Faroe Islands in Florence.

[30][31] Following an injury that had ruled him out of play for six months, Viviano was once again called up on 26 February 2012, ahead of Italy's friendly against United States three days later.

[34] Considered by pundits and footballing figures to be a promising goalkeeper in his youth, who was even touted as a potential successor to Gianluigi Buffon with the Italy national team, Viviano is known for his penalty saving abilities as well as his reflexes and shot-stopping capabilities between the posts; his ability to come off his line to deal with high balls has been cited as an area in need of improvement, however.

[39] In 2011, Kris Voakes of Goal.com described Viviano with the following words: "His 6ft 5in frame gives him a head start, but it is also thanks to his organisation, command of the area, anticipation and, naturally, his excellent shot-stopping abilities that he has become known as one of the best Serie A has to offer.