Captain Sergio Parisse and prop Martin Castrogiovanni, still involved in the French championship semi-finals, will join the group late after a break.
The squad will meet for the first time for a training camp near Bolzano from June 14th to July 3rd, before moving on to L'Aquila (July 12th-25th) then Fiuggi near Rome (August 2th-9th).
Brunel will announce his final 31-strong squad on August 9th. Italy warm up for the Sept 18-Nov 1 World Cup with tests against Scotland (August 22th and August 29th) in Turin and in Edinburgh, and against Wales (Sept 5th) in Cardiff.
Matias Aguero (Zebre), Martin Castrogiovanni (Toulon/FRA), Dario Chistolini (Zebre), Lorenzo Cittadini (Wasps/ENG), Alberto De Marchi (Sale/ENG), Michele Rizzo (Leicester/ENG), Leonardo Ghiraldini (Leicester/ENG), Davide Giazzon (Treviso), Andrea Manici (Zebre), Valerio Barnabo (Zebre), George Biagi
(Zebre), Marco Bortolami (Zebre), Joshua Furno (Newcastle/ENG), Marco Fuser (Treviso), Quintin Geldenhuys (Zebre), Robert Barbieri (Leicester/ENG), Marco Barbini (Treviso), Mauro Bergamasco (Zebre), Simone Favaro (Treviso), Francesco Minto (Treviso), Sergio Parisse (Stade Français/FRA), Samuela Vunisa (Zebre), Alessandro Zanni (Treviso)
Edoardo Gori (Treviso), Guglielmo Palazzani (Zebre), Marcello Violi (Calvisano), Kelly Haimona (Zebre), Tommaso Allan (Perpignan/FRA), Enrico Bacchin (Treviso), Tommaso Benvenuti (Bristol/ENG), Michele Campagnaro (Treviso), Angelo Esposito (Treviso), Gonzalo Garcia (Zebre), Andrea Masi
(Wasps/ENG), Luke McLean (Sale), Luca Morisi (Treviso), Simone Ragusi (Treviso), Leonardo Sarto (Zebre), Giovanbattista Venditti (Zebre), Michele Visentin (Zebre)
Tommaso Boni (Mogliano), Carlo Canna (Fiamme Oro), Leandro Cedaro (La Rochelle/FRA), Tommaso D'Apice (Zebre), Andrea De Marchi (Zebre), Paul Derbyshire (Treviso), Andrea Lovotti (Zebre), Alberto Lucchese (Treviso), Alberto Sgarbi (Treviso), Giulio Toniolatti (Zebre)