Barcelona president Joan Laporta defended his handling of the Dani Olmo registration issue and lashed out at enemies attacking the club in a fiery speech on Tuesday.
Record 31-time Copa del Rey winners Barcelona were drawn at home against Real Betis in the last 16 on Wednesday.
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).
Last month Spanish prosecutors charged the Catalan club with corruption after payments of more than 7.3 million euros ($7.8 million) to a company owned by a former refereeing chief were uncovered earlier this year
FC Barcelona’s actions off the pitch keep on bringing attention for all the wrong reasons.
Pedri's goal helped Barcelona earn an agonising 1-0 win over Celta Vigo to move back top of La Liga on Sunday.
Inter Milan are teetering on the brink of full-blown crisis as they prepare for the visit of Barcelona to the San Siro, which will likely have a huge bearing on their chances of making the knockout stages of the Champions League.
Relentless striker Robert Lewandowski pounced twice as Barcelona hammered 10-man Elche 3-0 to move a point clear at the top of La Liga on Saturday.
Barcelona striker Pierre-Emerick Aubameyang said Wednesday his jaw was injured during a violent armed robbery at his home but he expects to recover "in no time".
Barcelona were held 0-0 by Rayo Vallecano in their opening game of the La Liga season and had captain Sergio Busquets sent off late on.
Barcelona's attempts to establish themselves once again as a force in La Liga and the Champions League this season have seen the heavily-indebted Catalans gamble with their future to enable a striking summer spending spree.
La Liga is reportedly refusing to allow FC Barcelona to register new players ahead of the new season.
Uruguay great Luis Suarez made his second debut for his boyhood club Nacional on Tuesday but could not prevent them from falling to a 1-0 defeat at home to Atletico Goianiense.
