Barcelona host Osasuna on Sunday with coach Gerardo Martino under pressure after disappointing results that have dented their title hopes.
The Catalan club's prospects of retaining the La Liga crown have been significantly damaged after a number of surprising defeats in recent weeks.
Martino's men were stunned 1-0 by struggling Real Valladolid last weekend, slumping to a loss against a side that is battling against relegation and had won just four previous league matches this campaign.
That setback made it three defeats in six league games for Barca, with the other two reverses coming against Valencia and Real Sociedad respectively.
Barca are third in La Liga as a result of their poor form, four points adrift of league leaders and arch rivals Real Madrid.
Valladolid's shock victory over the 22-time Spanish champions has led to scathing criticism of Martino, whose position has come under increasing scrutiny.
However, the Argentinian was able to silence his critics somewhat in midweek with a 2-1 (4-1 agg) success against Premier League side Manchester City in the UEFA Champions League last 16.
And Barca will be confident of building on that triumph against an Osasuna side that has lost on all of their last five visits to the Camp Nou in all competitions, conceding 21 goals.
Osasuna did hold Barca to a 0-0 draw in the reverse fixture in October, but two consecutive defeats have seen them pulled back into the battle against relegation.
Javi Garcia's side are only three points clear of safety heading into the weekend's fixtures, with 11 games remaining, and could be pulled even further towards the drop with defeat at Barcelona.
However, despite Osasuna's current struggles, striker Oriol Riera, who spent six years as a youngster at Barcelona, is hopeful they can prove to be a test for their hosts.
"Playing against one of the top three sides is always very difficult, but we're going there keen to make things difficult for them," he told the club's official website.
"We will make their lives difficult. At least, that's what we’ll be trying to do."
Jonathan dos Santos (knee) and Isaac Cuenca (hamstring) are both out for Barcelona, and Martino may elect not to play defender Gerard Pique, who is on the verge of a suspension.
Pique is one booking away from a ban and will miss next weekend's Clasico clash with Real should he receive a yellow card on Sunday.
Meanwhile, Osasuna could welcome back defender Marc Bertran (hamstring), while Sisi (knee) and Miguel de las Cuevas (toe) are still on the sidelines.
|10||L. Messi||18' 63' 88'|
|Coach: G. Martino|
for Xavi 61'
for A. Sánchez 77'
for J. Mascherano 82'
|Terry: Too long between titles|
|Pepe puts Morata friendship aside for Champions League match-up|
|Hazard can be as good as Messi, Ronaldo - Fabregas|
|Carlisle ´deeply ashamed´ about suicide attempt|
|Tevez planning to win Champions League with Juve|
|Blatter ´knows absolutely nothing´ - Maradona|
|Allegri: Ancelotti a smart man|
|Sunderland academy coach to manage Oldham|
|Primeira Liga Review: Braga secure Europa League berth|
|Bruce backing Hull to respond against Burnley|
|Almeria 2 Celta Vigo 2: Bifouma, Zongo inspire hosts´ comeback|
|Arsenal can mount title bid - Wenger|
|Turkish Super Lig Review: Besiktas and Galatasaray remain locked at the top|
|Cagliari 4 Parma 0: Festa revival back in gear|
|Hull City 1 Arsenal 3: Sanchez at the double as visitors close on second|
|Blackpool - Huddersfield game will not be finished|
|Allegri vindicated by Juventus success|
|Russian Premier League Review: Krasnodar close the gap as Zenit slip up|
|Al Ahly dismiss Garrido|
|MLS Preview: Kinnear returns to Dynamo with Earthquakes|
|Ancelotti all out for victory against Juventus|
|Ramires recovering well after sickness|
|Prince Ali would back rival FIFA candidate to oust Blatter|
|Barcelona v Bayern Munich: Guardiola makes Camp Nou return|
|Kruse a target for Wolfsburg - Allofs|
|Fletcher backing Bournemouth to ´surprise a few´|
|Bremen agree deal with Fritz|
|Carver gets Newcastle backing|
|Blaszczykowski suffers groin tear|
|Boateng warns of Barca ´storm´|
|Brouwers agrees Gladbach extension|
|Benzema to miss Turin trip|
|England great Jimmy Greaves suffers stroke|
|Cabaye concerned by bit-part role at PSG|
|Parry: Anfield expansion a major boost|
|Ki targets Arsenal win and seventh spot|
|Pirlo eyes potential Champions League swansong|
|Mourinho rounds on critics after clinching title|
|Henderson: Liverpool can push on without Gerrard|
|Lack of goals a concern for Van Gaal|
|Hard to keep Benteke - Bacuna|
|MLS Review: Sporting KC end Chicago streak, Martins brace furthers NYC pain|
|Copa Libertadores Preview: River eye revenge in Superclasico|
|Garcia lauds ´impressive´ Roma|
|Pavon goal scores him a BMW for a month|
|Boca beat River in Superclasico|
|Inzaghi to blood youth after third straight Milan defeat|
|Blanc urges PSG to ´remain vigilant´|
|La Liga Review: Valencia go clear of Sevilla, crisis-stricken Elche safe|
|CAF Champions League Review: ES Tunis dumped out by Al Merreikh|
|Masterful Mourinho has Premier League and Chelsea singing his tune|
|Nantes 0 Paris Saint-Germain 2: Cavani nets again as Ibrahimovic returns|
|Napoli 3 Milan 0: Late treble saves hosts|
|Primeira Liga Review: Porto edge past strugglers Vitoria|
|Bundesliga Review: Hamburg claim last-gasp winner, Gladbach close in on Wolfsburg|
|Pochettino: Hart heroics the difference|
|Ligue 1 Review: Monaco remain on course for third, Lille cruise past Lens|
|Pellegrini silent over City future|
|Rome derby not on Lazio´s radar, says Pioli|
|Pardew laments penalty calls in Palace´s loss to champions|
|Serie A Review: Roma move back into second, Di Natale overtakes Baggio|
|Tottenham 0 Manchester City 1: Aguero heaps more misery on Spurs|
|Mourinho appears to take dig at old nemesis Guardiola|
|Mancini frustrated by resilient Chievo|
|Drogba coy over future after title triumph|
|Chelsea title win will not lead to domination - Mourinho|
|Inter 0 Chievo 0: More frustration for Mancini|
|Terry: I´ve proved Benitez wrong|
|BREAKING NEWS: Chelsea secure Premier League title|
|Chelsea 1 Crystal Palace 0: Title heads back to Stamford Bridge|
|League One Review: MK Dons promoted, as Orient, Notts County and Crawley go down|
|Dortmund striker Ramos set to miss Copa America|
|Williamson denies getting sent off on purpose|
|Eintracht Frankfurt´s Kittel suffers injury blow|
|Juventus v Real Madrid: Serie A kings set for Real test|
|United still control top-four destiny - Young|
|Record finish beyond Stoke - Hughes|
|Wellington Phoenix 0 Melbourne City 2: Surprise win sets up semi-final derby|
|Vidal already focused on Real|
|MLS Review: Revs hand Red Bulls first loss|
|AFC Champions League Preview: Wanderers facing elimination|
|Lyon stepped up despite pressure - Fournier|
|Gerrard anticipating emotional Anfield finale|
|´I´ve always wanted to score a free-kick past Neuer´ - Calhanoglu|
|Negredo: Pellegrini lost faith in me|
|Buffon had title doubts after Conte departure|
|Luis Enrique: I was worried during 8-0 win|
|Wilshere will return to his best - Wenger|
|Rodgers unconcerned by banner|
|Mourinho doesn´t want guard of honour|
|Deportivo La Coruna 1 Villarreal 1: Hosts come from behind|
|Juve canter to title success as Allegri wins over doubters|