Barcelona said on Thursday they agreed to pay the 18 million euros ($19.4 million) buyout clause in Braithwaite’s contract with Spanish league rival Leganes.
Bartomeu reiterated the club's denial of accusations it hired a company to make negative comments about its own players and opponents on social media in order to boost the image of senior club officials.
The result left Sevilla in fifth place and Espanyol second-to-last in the relegation zone of La Liga.
The victory left second-place Barcelona tied on points with Real Madrid at the top of the standings ahead of leader Madrid's home match against relegation-threatened Celta Vigo on Sunday.
Valencia haven't beaten Atlético since a league game at home in 2014, with six losses and five draws since then.
The match not only pits two of the top three teams in the Spanish league, it will also contrast the two most dissimilar playing styles in the competition.
The title race for La Liga continues as Barcelona and Real Madrid registered wins in their respective fixtures on Sunday.
Substitutes Lucas Vázquez and Luka Jovic added second-half goals for Madrid, which had won eight straight before the loss to Sociedad.
Fabian Orellana halved the difference for Eibar with a shot from outside the area with six minutes to play.
This season Madrid is leading the Spanish league and is undefeated in 21 matches largely thanks to its stingy defense.
Fati struck from a pair of passes by Lionel Messi to help Barcelona beat Levante 2-1, keeping the defending champion within three points of leader Real Madrid.
Karim Benzema scored a second-half winner to give Madrid its eighth straight victory this year and a six-point lead over second-placed Barcelona, which hosts Levante on Sunday.
Real Madrid vs Atletico Madrid Live Streaming, La Liga: Here are the details of When and Where to watch Madrid Derby live football match online.
Valladolid’s defence scrambled to clear a constant barrage of crosses into its box by the visitors until Toni Kroos finally connected with goalscorer Nacho Fernandez in the 78th minute.
Atletico never seriously threatened their modest crosstown rival at their Wanda Metropolitano Stadium in a match they needed to win to reclaim third place from Sevilla and stay in touch with Barcelona and Real Madrid.
La Liga president Javier Tebas said the incidents had done “serious damage to Spanish football.”
The loss was the first for Barcelona in three matches under coach Quique Setién, who was hired to replace Ernesto Valverde last week.
Atlético hit a new low under Simeone on Thursday when it was eliminated by third-division club Cultural Leonesa in the round of 32 of the Copa del Rey.
Barcelona secured a 1-0 win over Granada in Quique Setien's first game in-charge at the club in La Liga.
Wu Lei scored in the 88th minute to earn a 2-2 draw for Espanyol on Saturday as he drove a shot past the Barca goalkeeper Norberto Neto from a narrow angle after receiving a pass from Matias Vargas.
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