The trio, as well as Malcom and Nelson Semedo, will head to Japan although reports have claimed they are among six Barca players who could be makeweights in a deal to bring Neymar back to Camp Nou.
Philippe Coutinho, the sixth member of the group, is not included in a squad of 26 players named by Ernesto Valverde as he remains on holiday following the Copa America.
Lionel Messi is absent for the same reason, as are Uruguay striker Luis Suarez and Brazil midfielder Arthur, but Antoine Griezmann could make his Barca debut along with fellow new arrival Frenkie de Jong.
Neymar, meanwhile, is not in PSG's squad for Saturday's pre-season game against Nurnberg despite the forward saying he is almost 100 per cent fit after missing the Copa America due to an ankle injury.
PSG said the club will "take appropriate action" against the Brazil star after he failed to report to pre-season training on time, although Neymar's father said the Ligue 1 champions knew when he would be arriving.
Barca's first pre-season game ahead of the 2019-20 campaign is against Premier League side Chelsea in the Rakuten Cup on Tuesday.
Three days later, Barcelona face a reunion with former players David Villa and Andres Iniesta when they take on Japanese side Vissel Kobe.
The defending LaLiga champions will then kick off the new league season away to Athletic Bilbao on August 16.