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.
Philippe Coutinho officially joins Barcelona, completing a move from Liverpool thought to be worth 160 million euros ($192 million), making it the third richest transfer in history.
Real Madrid's faltering title defence continues as they were held to a thrilling 2-2 draw at Celta Vigo which saw them fall 16 points behind runaway leaders Barcelona, who beat Levante 3-0 to stay nine points clear at the top of La Liga.
Lionel Messi’s Barcelona contract does not include any political clauses, Barcelona based SPORT reports.
Philippe Coutinho finally gets his wish as Barcelona agree to sign the Brazilian star from Liverpool for 160 million euros ($192 million) in the third richest deal of all time.
Liverpool are likely to respond to a bid from Barca for Brazilian midfield dynamo Philippe Coutinho after they completely against any negotiation for the player last season.
Jurgen Klopp insists Philippe Coutinho was genuinely injured for Liverpool's 2-1 win at Burnley as he laughed off talk of the Brazil forward joining Barcelona.
After spilling the beans about Cristiano Ronaldo picking up his fifth Ballon d'Or a day before the event in Paris, Nike has yet again apparently leaked internal information as they began promoting Barcelona jerseys with Liverpool star Phillipe Coutinho's name on the back.
Barcelona's star playmaker Lionel Messi provides an incredible assist to Aleix Vidal while having no boot on his right foot.
Jose Mourinho's son celebrates Barca's clasico victory over Real Madrid by posting a selfie on twitter.
Barcelona are making moves to bring Atletico Madrid star Antoine Griezmann to the Catalan capital while Manchester City are eyeing Alexis Sanchez as clubs around Europe prepare for the January transfer window.
