Midfielder Cesc Fabregas moved Barcelona a step closer to the La Liga title with a late strike in a laboured 1-0 victory at home to mid-table Levante on Saturday.
The league, which is now conducting tests twice per week, did not name the people who tested positive but said they will self-isolate for 10 days.
United lost 3-2 at home to a fearless and skilful Athletic Bilbao, their second successive European defeat at Old Trafford, in the first leg of their round-of-16 tie. Central defender Xandao scored with a cheeky back-heel to give Sporting a 1-0 win over City in Lisbon, ending the Premier League leaders' run of six straight wins.
Levante continued to defy their humble status as Valencia's second club when they beat Real Betis 3-1 to reclaim fourth place in La Liga on Monday.
Barcelona midfielder Cesc Fabregas is set to miss a big chunk of Spain's preparations for Euro 2012 after being ruled out for seven to 10 days with a hamstring strain, the Spanish club said on Saturday.
Barcelona gave Pep Guardiola a fitting end to his glittering four-year reign as coach winning the King's Cup final against Athletic Bilbao 3-0 on Friday to send him off with a 14th trophy under his arm.
Barcelona won their 26th King's Cup when two goals from Pedro and one from Lionel Messi gave them a 3-0 victory over Athletic Bilbao in coach Pep Guardiola's final match in charge on Friday.
Outgoing Barcelona coach Pep Guardiola sought to make the succession of his number two Tito Vilanova as smooth as possible as he gave his last Nou Camp news conference on Thursday, ahead of the King's Cup final.
Barcelona defender Gerard Pique blamed the club's pre-season trips to the United States and Japan for their shaky start to the season.
A Champions League spot, two Europa League berths and two relegation places are to be claimed or avoided in what promises to be a nerve-wracking finale to the La Liga season on Sunday.
Pierre-Emerick Aubameyang scored twice as a rejuvenated Barcelona gave a football masterclass to inflict a humiliating 4-0 defeat on rivals Real Madrid on Sunday.
Real, who have smashed the La Liga scoring record, clinched their 32nd league crown and their first in four years when Gonzalo Higuain, Mesut Ozil and Cristiano Ronaldo struck in a frenetic 3-0 win at 10-man Athletic Bilbao on Wednesday.
Fernando Llorente netted a dramatic late winner for Athletic Bilbao to eliminate Sporting and Atletico Madrid comfortably held on to a first-leg lead to oust La Liga rivals Valencia on Thursday and set up an all-Spanish Europa League final.
Barcelona playmaker Xavi will be out of action for around 15 days with a damaged left calf muscle, the Spanish champions said on Thursday.
Barcelona have a doubt over midfielder Xavi as they prepare to go on the offensive in their Champions League quarter-final second leg against AC Milan on Tuesday.
Cristiano Ronaldo inspired Real Madrid to a rampaging 5-1 win at Osasuna as the leaders hit the 100-goal mark this season and maintained a six-point lead over chasing Barcelona on Saturday.
Athletic Bilbao, conquerors of Manchester United in the previous round, continued their Europa League run by scoring three times in the last 20 minutes to win their quarter-final first leg tie 4-2 at Schalke 04 on Thursday.
Former UEFA Cup winners Anderlecht reached the Europa League knockout stage with the only perfect record on Thursday and were joined in the last 32 by Athletic Bilbao, Legia Warsaw, PSV Eindhoven and Twente Enschede with two games to spare.
Athletic Bilbao's bid for a berth in next season's Europa League stuttered when they lost 2-1 at Espanyol on Monday.
Barcelona set up a King's Cup final against Athletic Bilbao when Cesc Fabregas scored one goal and created another for Xavi in a 2-0 win over 10-man Valencia in their semi-final second leg on Wednesday.
Marco Ruben's header put Villarreal up to third in La Liga with a 1-0 win at Athletic Bilbao on Sunday, after Valencia fell to a solitary Ivan Rakitic strike in a pulsating encounter with Sevilla.
Colombian pop star Shakira and Barcelona's Gerard Pique aren't afraid to show PDA!
Iker Muniain gave Athletic a deserved lead in the 32nd minute by bundling the ball home after Real failed to get back in time to defend a counterattack.
Schalke 04, Lokomotiv Moscow and Stoke City sealed places in the last 32 of the Europa League but a 2-0 defeat at Salzburg left Paris St Germain coach Antoine Kombouare looking over his shoulder on Thursday.
Karim Benzema netted a second-half hat-trick as Real Madrid got back to winning ways with a 3-0 victory over Athletic Bilbao in La Liga on Sunday.
Real Madrid went five points clear at the top of La Liga after coming through a testing game at Athletic Bilbao to win 2-1 thanks to Brazilian midfield lynchpin Casemiro's strike on Saturday.
The win took Barca to the top of the standings on 68 points although Real Madrid, on 65, will reclaim their lead due to their superior head-to-head record if they beat Real Mallorca at home on Wednesday.
Spain coach Vicente del Bosque sprung three surprises in his 23-man squad for the World Cup in South Africa, including Barcelona pair Victor Valdes and Pedro plus Athletic Bilbao midfielder Javi Martinez. Goalkeeper Valdes replaces Villarreal's Diego Lopez as Spain's third-choice behind number one and captain Iker Casillas of Real Madrid and number two Pepe Reina of Liverpool.
Real Sociedad's Inigo Martinez scored from inside his own half in the Basque derby on Sunday, but Fernando Llorente's brace made sure Athletic Bilbao earned a 2-1 away win in La Liga.
La Liga champions Barcelona fell to their first opening day defeat of the season in 11 years when they were beaten 1-0 at Athletic Bilbao thanks to a sensational late overhead kick from veteran striker Aritz Aduriz.
A new-look Atletico Madrid suffered a setback in their opening La Liga match of the season when they squandered several chances and twice struck the post in a 0-0 home draw with Osasuna on Sunday.
La Liga leaders Barcelona moved 10 points clear with a 4-1 win at Real Betis on Sunday after second place Atletico Madrid slipped up at Athletic Bilbao on Saturday in a 2-0 defeat.
Injured Barcelona forward Lionel Messi is almost irreplaceable but the Spanish champions are determined to put his temporary absence behind them, coach Pep Guardiola said on Tuesday.
Barcelona rode their luck to come from behind and win 2-1 at Real Sociedad on Saturday, continuing to banish their awful record in San Sebastian and maintaining their perfect start to the La Liga season.
News of all that transpired on and off the football field.
Real Madrid forward Karim Benzema kept up his impressive run of form by scoring and providing two assists in a 3-1 win away to Eibar on Sunday, taking the champions level on points with La Liga leaders Atletico Madrid.
Athletic Bilbao boosted their chances of securing a place in next season's Europa League when they fought back from a goal and a man down to snatch a 2-1 victory at struggling Osasuna on Sunday.
Spain striker Fernando Llorente scored in Athletic Bilbao's 2-1 La Liga victory over struggling Real Zaragoza on Sunday to continue his prolific recent run.
Manchester Utd's Fred receives racist abuse after defeat by Liverpool.
Athletic Bilbao forward Urko Vera netted his first La Liga goal deep into added time to snatch a 2-2 draw for the Basque club at Getafe on Monday.