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Real Madrid extended their lead at the top of the La Liga table to six points after a 4-1 win at Osasuna on Sunday.
Former Osasuna executive Angel Vizcay has said his club paid hundreds of thousands of euros to La Liga clubs to help the club avoid relegation.
Atletico Madrid moved back into the top four by earning a commanding 2-0 win at home to Osasuna on Saturday.
Sevilla slipped further behind La Liga pacesetters Barcelona and Real Madrid on Sunday after being held to a 1-1 draw away to Osasuna.
Granada provisionally climbed into second place in Spain's La Liga on Friday after edging past visitors Osasuna 1-0 courtesy of Domingos Duarte.
Vinicius Jr. scored a stunning goal to help Real Madrid beat Osasuna at the Bernabeu on Wednesday night to move into first place in La Liga.
Ansu Fati's goal in Barcelona's draw at Osasuna on Saturday saw him become the club's youngest-ever goalscorer in La Liga.
Ansu Fati became the youngest Barcelona player to score in La Liga but his side were held to a 2-2 draw away at Osasuna on Saturday.
Osasuna sealed their promotion to La Liga on Monday with three games to spare after Granada beat Albacete 1-0.
Osasuna have sacked coach Petar Vasiljevic following his failure to keep the club in La Liga.
Barcelona followed up Sunday's thrilling Clasico victory with a 7-1 thrashing of lowly Osasuna to further keep their La Liga title hopes alive.
"I've already said that we need a plan for Messi and the players told me [that we need to] carry handcuffs and a pistol," Osasuna's coach said.
Atletico Madrid kept themselves ahead in the battle with Sevilla for third place after a 3-0 win over bottom club Osasuna.
Atletico Madrid defeated Malaga 2-0 to secure their fourth consecutive win and regain third place in La Liga on Saturday.
Kenan Kodro struck a late equaliser as rock-bottom Osasuna ended their six-match losing streak with a 1-1 draw at home to Eibar.
Real Madrid scored three goals after the hour mark to secure a sensational 3-2 come-from-behind victory over Villarreal in La Liga action on Sunday.
The injury happened midway through the first half of the game at El Sadar, with Tano coming out the worst after a collision between he and Isco.
Cristiano Ronaldo and Isco scored to help Real Madrid to a slim 3-1 win at bottom side Osasuna.
Samir Nasri passed up the chance to fire Sevilla closer to La Liga leaders Real Madrid from the penalty spot.
Osasuna have signed Italy international goalkeeper Salvatore Sirigu for the remainder of the season, the Liga club have announced.
Osasuna wasted the chance to move off the foot of La Liga by drawing 1-1 at home with Malaga.
With a remarkable injury time goal, Real Madrid salvaged a 3-3 draw against Sevilla in the Copa del Rey to set a Spanish record of 40 games unbeaten.