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.
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.
Spanish football club Barcelona sold a 25% stake in its audiovisual studio to digital fan token firm Socios.com for 100 million euros ($102 million), club chief Joan Laporta said on Monday, as the LaLiga giant steps up efforts to bring in revenue to register new players.
French winger Dembele opened the scoring with his third goal in two matches. From a pass by Raphinha he unleashed a right-footed blast into the bottom right corner of Carlos Coronel's net.
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.
