Hansi Flick's Barca are a step away from reaching the semi-finals for the first time since 2019 and extended their unbeaten run to 23 matches.
Spain's National Sports Council (CSD) on Thursday upheld an appeal filed by Barcelona players Dani Olmo and Pau Victor which will allow them to play for the club until the end of the season, a decision LaLiga said they would appeal.
La Liga said Wednesday Barcelona did not have the financial capacity to register players Dani Olmo and Pau Victor and still lack it, ahead of a decision by Spain's sports council (CSD) over the duo's eligibility to play.
Barcelona and Osasuna appealed against the decision to play the game on Thursday after it was initially postponed on March 8 following the death of a doctor at the Catalan club, but their pleas were ignored.
Having clawed their way back to the top of the pile, leading Los Blancos on goal difference, Hansi Flick's side are determined to hold on to top spot.
Although Belgian striker Robert Lewandowski scored the decisive goal in the 61st minute, it was Yamal who stole the spotlight at the Lluis Companys Olympic Stadium.
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.
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.
PSG play Barcelona later in a Champions League soccer quarter-final to be viewed by millions around the world.
Xavi has insisted there has been no change to his decision to leave Barcelona at the end of the season.
Having come through the fabled academy at Barcelona, Arteta has a long-standing connection to the Camp Nou.
