Barca remain on 34 points and lead second-placed Real Madrid by four but their rivals now have two games in hand, while the victory moved Las Palmas up to 14th place on 15 points.
Barcelona cited UEFA rules preventing clubs from changing stadiums during the Champions League's opening phase and "the logistical difficulties and extra costs" if they kept open two grounds at the same time.
A product of Barcelona's youth academy, Bernal has made three league appearances since his debut for the senior team in their LaLiga opener against Valencia.
Barcelona's next away game is at Serbian club Crvena Zvezda in Belgrade on November 6.
Olmo will miss Barcelona's opening Champions League matches against Monaco and Young Boys.
The German coach took charge of his first home match since he was appointed in May.
Barcelona signed Spain star Dani Olmo from RB Leipzig on Friday for a reported 60 million euros ($65 million).
New Barcelona coach Hansi Flick on Thursday hailed the performance of the Spanish club's teenage winger Lamine Yamal at Euro 2024, calling it "unbelievable".
The No. 19 at Barcelona previously belonged to Vitor Roque for a brief period.
Former Liverpool and Barcelona forward Luis Suarez has re-joined Uruguayan team Nacional on a free transfer, returning to the Montevideo-based club after 16 years in Europe.
Ousmane Dembele and Moise Kean scored two goals apiece as Barcelona and Juventus fought to an entertaining 2-2 draw in their US pre-season friendly in Dallas on Tuesday.
Luis Suarez has entered a pre-contract agreement to join Uruguayan club Nacional as a free agent, the former Liverpool and Barcelona striker said on Tuesday.
The longest going transfer saga has continued as there is yet another twist in Chelsea's attempts to secure Jules Kounde. Although the Blues felt confident they had done enough to secure his signing at the start of the weekend, Barcelona's apparent U-turn to prepare a bid has put this in doubt.
Raphinha made it two goals in two matches as Barcelona defeated Real Madrid 1-0 on Saturday in their Las Vegas Clasico.
Barcelona take on Real Madrid in a pre-season Clasico friendly in Las Vegas on Saturday that promises to offer a glimpse into the future of the Spanish giants' iconic rivalry.
Barcelona's new signing Raphinha shone with a goal and two assists in his pre-season debut as the Spanish giants thrashed Inter Miami 6-0 in their U.S. tour on Tuesday.
Robert Lewandowski will bring the 'winning mentality' Barcelona need according to new team-mate Andreas Christensen.
FC Barcelona head coach Xavi Hernandez has been denied access to the United States and will therefore not join the Catalans on their upcoming American preseason tour as things stand.
Poland striker Robert Lewandowski is set to join Barcelona after Bayern Munich reached a verbal agreement with the LaLiga side on a transfer, the Bundesliga champions said on Saturday.
