Treviso coach Umberto Casellato has secured the signatures of Enrico Bacchin, Simone Ragusi and Matteo Zanusso, who all agree new contracts.
Despite losing 17-13 to Scarlets in the final round of the regular-season, the Italian outfit finished ahead of Zebre to secure a Champions Cup place.
On the back of that, they have moved quickly to tie in the aforementioned trio.
"Benetton Rugby Treviso continues their preparation for the 2015/2016 season, with the extensions of the contracts of Enrico Bacchin, Simone Ragusi and Matteo Zanusso," read a club statement.
"This brings the total number of contract renewals and new players already announced for next year's campaign to 27.
"Enrico Bacchin made 19 appearances this year, and blends speed and vision. He has the power and impact required from a player in the centres, and even emerged for Italy this year.
"Simone Ragusi is an exciting player, who is capable of great invention on the wing and made 18 appearances last season.
"While prop Matteo Zanusso was our only player to play every game last year, with 28 appearances, and is definitely one for the future."