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.
With the acquisition of Robert Lewandowski all but done, Barcelona are set to be back in the La Liga title race in 2022-23 -- providing that they can register their new signing. Back in May, Lewandowski said, "My era at Bayern is over. I don't see any possibility to continue playing for this club anymore." While he did return to preseason training for the German side, there was an expectation that Barcelona would eventually find a way to hit their asking price and they did just that.
French international winger Ousmane Dembele, whose contract with Barcelona expired last month, ended six months of speculation by agreeing to 'rejoin' the Catalan side, the club announced on Thursday.
Barcelona president Joan Laporta said Wednesday that Dutch midfielder Frenkie de Jong is not for sale despite rumours of a departure to the Premier League.
Ivory Coast midfielder Franck Kessie said the opportunity of playing under the guidance of manager Xavi Hernandez was crucial in his decision to join Barcelona on a free transfer after leaving AC Milan.
While criticising Joan Laporta's management, Ronald Koeman has claimed Barcelona are caught up in their own history as football evolves beyond their identity on the pitch.
Lionel Messi and Cristiano Ronaldo hit a combined total of 1,000 goals for Barcelona and Real Madrid after both score in the latest clasico fixture.
Barcelona coach Ernesto Valverde's conservatism is cited by the Spanish media as the main reason for their 3-0 defeat at AS Roma that led to a shock Champions League quarter-final elimination being regarded as "a historic debacle".
Barcelona's midfield maestro Andres Iniesta suggests that the match against AS Roma in the Champions League could have been his last match in the competition.
Barcelona equal the record longest unbeaten run in La Liga history as a Lionel Messi hat-trick inspire the runaway leaders to a 3-1 win over Leganes to make it 38 league games unbeaten.
AS Roma coach Di Fracesco complains that Barcelona received help from the referee during his side’s 4-1 defeat at the Camp Nou.
