Runaway Premier League leaders Manchester City beat champions Chelsea 1-0 at the Etihad Stadium on Sunday to extend their lead to 18 points and leave the London side further adrift from the Champions League qualification spots.
Lionel Messi became the first player to win 10 La Liga crowns with Barcelona and only the third player from any club to do so.
The draw means second-placed Atletico Madrid could close the 12-point gap with Barcelona, who are on 74 points, if they beat Celta Vigo later on Saturday.
Barcelona coach Ernesto Valverde will be banking on new signing Ousmane Dembele to fill the gap left by Neymar's departure as he looks to overcome off-pitch difficulties when the Catalans take on Espanyol on Saturday.
Here, Reuters Sport highlights five reasons why last season's double winners have collapsed.
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.
Liverpool manager Brendan Rodgers was adamant that he did not regret his team selection despite falling to a fifth Premier League defeat against table-topping Chelsea on Saturday.
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.
Liverpool were on the end of the biggest sensation of the English Premier League season when bottom club Swansea City repelled a dramatic comeback from Juergen Klopp's title chasers to earn their first-ever league win at Anfield.
Griezmann goal earns Atletico first win of season
Sarri was without Cristiano Ronaldo for the trip to the Gewiss Stadium as the Portuguese forward recovers from a knee problem ahead of Tuesday's Champions League meeting with Atletico Madrid in Turin.
Liverpool scored a stunning 3-2 win over bottom side Queens Park Rangers with four goals coming in a frenzied seven-minute finale at Loftus Road as the drama continued in the Premier League on Sunday.
While, Reds' manager Juergen Klopp is realistic about his team being league leaders, you, dear reader, can convey your opinion by casting your vote in the poll below
A stunning strike by Romelu Lukaku gave Inter Milan a 2-1 win at Brescia on Tuesday although they had to cling on for three points in the face of heavy pressure from the promoted side.
Belgium struck early and held off a late Brazil fightback to send the five-time champions tumbling out of the World Cup with a 2-1 victory in an end-to-end thriller on Friday that earned them a semi-final against France.
Images from the English Premier League matches played at Old Trafford on Saturday
Brazil need solutions after coming unstuck against Swiss
Angelo Ogbonna leapt high to power home a header in the dying seconds of extra time to claim a timely first goal for the club as West Ham United sank Liverpool 2-1 on Tuesday to reach the last 16 of the FA Cup.
Jordon Ibe came off the bench to drive home the winner as Liverpool took a big step towards reaching the League Cup final with a 1-0 victory at Stoke City in the first leg of their last-four tie on Tuesday.
Liverpool were left frustrated by Championship side Blackburn Rovers who defended heroically to draw 0-0 at Anfield.
Liverpool will attempt to sweep away the January blues on the last day of a wretched month when they host commanding Premier League leaders Chelsea at Anfield on Tuesday.
A stoppage time goal by a heavily-bandaged Martin Skrtel spared Liverpool another deflating defeat as they drew 2-2 at home to Arsenal in the Premier League.
Sevilla became surprise Liga leaders on Sunday after beating visiting Celta Viga 2-1 while champions Barcelona drew 1-1 at Valencia thanks to another Lionel Messi strike but are still without a victory in their last four league games.
Barcelona forwards Lionel Messi, Philippe Coutinho and Luis Suarez combined to devastating effect to hammer Girona 6-1 on Saturday as they went 10 points clear at the top of La Liga and set a club record of 32 games unbeaten in the league.
Images from football action around European leagues played on Sunday
Lionel Messi created a goal and scored another as Barcelona came from behind to beat struggling Rayo Vallecano 3-1 at home on Saturday and stay seven points clear at the top of La Liga.
Quaison fires Sweden to extra-time World Cup playoff win over Czechs
Former Manchester United striker Andy Cole is recovering in hospital after undergoing a kidney transplant, the club said in a statement on Friday.
Brazil hammered Bolivia 5-0 in World Cup qualifiers on Thursday, giving coach Tite his third successive win in the most convincing performance from the five-time world champions for some time. Bolivia had not won a World Cup qualifier away from home since 1993 but Brazil were still excellent, particularly in the first half, when they scored four of their five goals.
Real Madrid's faltering title defence continued as they were held to a thrilling 2-2 draw at Celta Vigo on Sunday which saw them fall 16 points behind runaway leaders Barcelona, who beat Levante 3-0 to stay nine points clear at the top of La Liga.
World champions Germany drew 1-1 with Spain in a high tempo friendly on Friday as they launched their preparations for a title defence in Russia while their opponents had striker Diego Costa making his long-awaited comeback as a substitute.
Champions Barcelona moved five points clear at the top of La Liga with a 2-1 win at Getafe, while Real Madrid fell to a 2-0 defeat by Real Sociedad.
Juan Mata struck twice, including a sublime volley, for Manchester United in a 2-1 Premier League victory over Liverpool who had Steven Gerrard sent off for a stamp at Anfield on Sunday.
Klopp has led Liverpool to back-to-back Champions League finals but is adamant that their impressive recent track record does not make them the title favourites.
IMAGES from the Champions League 2nd semi-final first leg match between Barcelona and Liverpool at Nou Camp on Wednesday
Liverpool ended their topsy-turvy 2014 on a high after two goals from Adam Lallana, one excellent and one freakish, helped inspire their 4-1 trouncing of Swansea on Monday in the last Premier League game of the year.
The Reds' manager believes his team has the ability to finish in the top four and qualify for Champions League next season.
Two months after dropping him following a string of mistakes, ManchesterCity manager Manuel Pellegrini on Friday hailed goalkeeper Joe Hart as "the best in England".
Theo Walcott's double fired Arsenal back to the top of the Premier League as the Gunners got their title challenge back on track with a 3-1 victory at West Ham United on Thursday.
One of the most eagerly-awaited clashes of the Premier League season turned into a major letdown as Liverpool and Manchester United nullified each other in a largely undistinguished goalless draw at Anfield on Monday.