Barcelona will remain in the Copa del Rey after the RFEF's competition committee said on Friday it had rejected Levante's complaint.
However, Barca's status in a competition is unclear after Levante said they would file a complaint to the Spanish federation.
Trailing 2-1 entering the night, Barca had no trouble with Levante; Ousmane Dembele scored two first-half goals before a Leo Messi insurance tally.
Levante president says the club will lodge a formal complaint against Barcelona with the Spanish FA [RFEF] for fielding an ineligible player.
Real Madrid advanced to the quarterfinals of the Copa del Rey but a disinterested second leg, namely from Isco, will not have inspired confidence.
"It was a difficult game, but the performance was weak," Real Madrid boss Santi Solari on the team's loss in Copa del Rey action.
Danish forward Martin Braithwaite struck the only goal of the game on the half-hour mark, finishing into an empty net from close range.
Atletico Madrid crashed out of the Copa del Rey to Girona on Wednesday following a highly entertaining 3-3 draw at home.
Barcelona rested several stars in the Copa del Rey on Thursday night and lost the first leg to Levante. It might make sense to focus elsewhere.
"In the first half, we came out asleep and they were able to take advantage of that, putting us on the ropes with two goals," Busquets said.
With many starters, including Lionel Messi rested, Philippe Coutinho and Malcom scuffed a huge chance to impress in the Copa del Rey at Levante.
Levante ran out shock 2-1 winners against Barcelona in the first leg of their Copa del Rey round-of-16 matchup on Thursday night.
Real Madrid coach Santi Solari said that Wednesday's 3-0 Copa del Rey last 16 first leg win against Leganes at the Bernabeu could "liberate" them.
Santi Solari and Real Madrid needed a win in the worst way, and in the Copa del Rey against Leganes, they got it thanks in large to young Vinicius.
Real Madrid pulled away from Leganes in the second half for a 3-0 win in their Copa del Rey first-leg tie on Wednesday.
Atletico Madrid earned a 1-1 draw away to Girona in a chaotic and entertaining Copa del Rey last 16 first-leg match on Wednesday.
Nick Blackman came off the bench to score the winner as Sporting Gijon beat floundering Valencia 2-1 in the first leg of their Copa del Rey tie.
Having not started any of Solari's first seven games as Madrid coach, Isco came into a much rotated XI and found the net with a trademark strike.
Real Madrid trounced third division side Melilla 6-1 in a Copa del Rey round of 32 second leg on Thursday, completing a 10-1 aggregate victory.
Former regulars Isco and Marco Asensio starred in the Copa del Rey as they try to work their way back into Santi Solari's good graces.
Denis Suarez struck twice for Copa del Rey holders Barcelona as they thrashed Cultural Leonesa 4-1 to progress to the round of 16 5-1 on aggregate.
A second-half salvo from Atletico Madrid helped them sweep past Sant Andreu 4-0 on Wednesday and into the Copa del Rey round of 16 5-0 on aggregate.
Melilla have to use three different modes of transport to travel from Africa's north coast -- just to complete a cup tie they're already losing 4-0.
It was a night for Barcelona's youngsters as the La Liga leaders easily handled Cultural Leonesa in Copa del Rey action.
Ernesto Valverde picked a team of youngsters and squad players against Cultural Leonesa. Some responded to the call, others did not.