Xavi described Sunday's loss as lowly Almeria as Barcelona's "worst game of the season" as the Catalans failed to capitalise on Real Madrid's derby draw with Atletico to extend their advantage at the top of La Liga.
El Bilal Toure's fine first-half strike earned Almeria their first ever victory over Barca, inflicting only the second defeat of the league campaign on Xavi's men.
Barcelona still top La Liga by seven points over champions Madrid as they chase a first Spanish league title since 2019.
But the setback at Almeria ended Barca's 13-game unbeaten league run and follows a 2-1 defeat at Manchester United on Thursday that ended their Europa League hopes.
Barca face Madrid in a Clasico Copa del Rey semi-final first leg on Thursday at the Bernabeu, with their vulnerabilities starting to show.
"I'm very angry because I think we played our worst game of the season," Xavi told Movistar.
"Above all in the first half, we couldn't move the ball around, we lacked intensity, speed, on a day where we couldn't mess up.
"We did not show the passion [we needed] to win the game. In the second half, yes, but they defended well."
Xavi, already without injured trio Pedri, Ousmane Dembele and Ansu Fati, took a risk and rotated heavily and his team paid the price.
The lowly hosts, starting the game 19th with just one victory in their prior eight league games, were on top and went ahead through Toure's emphatic finish.
The Mali international cushioned a long ball into striker Luis Suarez's path, before spinning and breaking forward at pace.
Suarez lofted a pass over Andreas Christensen and Toure ran on to it, lashing an effort past Marc-Andre ter Stegen and in off the crossbar.
It was only the eighth league goal Barcelona have conceded this season, stopping Ter Stegen adding to his impressive tally of 17 clean sheets.
Ter Stegen said Barcelona would recover ahead of the cup clash against Madrid.
"It's a defeat, it always hurts, it never arrives at a good moment, but we will calm ourselves," said the goalkeeper.
"It's important to charge our batteries for Thursday. We're looking forward and we will achieve what we want to."
Almeria rose to 15th, two points clear of the relegation zone.
"The best team in the league came to us, they're first, and we were capable of blocking them, of taking advantage of the chance we had," Almeria coach Rubi told Movistar.
Mina Cup winners
Under 12 – Minerva Academy
Under 14 – Unam Pumas
Under 16 – Fursan Hispania
Under 18 – Madenat
WRESTLING HIGHLIGHTS
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PROFILE OF HALAN
Started: November 2017
Founders: Mounir Nakhla, Ahmed Mohsen and Mohamed Aboulnaga
Based: Cairo, Egypt
Sector: transport and logistics
Size: 150 employees
Investment: approximately $8 million
Investors include: Singapore’s Battery Road Digital Holdings, Egypt’s Algebra Ventures, Uber co-founder and former CTO Oscar Salazar
Milestones on the road to union
1970
October 26: Bahrain withdraws from a proposal to create a federation of nine with the seven Trucial States and Qatar.
December: Ahmed Al Suwaidi visits New York to discuss potential UN membership.
1971
March 1: Alex Douglas Hume, Conservative foreign secretary confirms that Britain will leave the Gulf and “strongly supports” the creation of a Union of Arab Emirates.
July 12: Historic meeting at which Sheikh Zayed and Sheikh Rashid make a binding agreement to create what will become the UAE.
July 18: It is announced that the UAE will be formed from six emirates, with a proposed constitution signed. RAK is not yet part of the agreement.
August 6: The fifth anniversary of Sheikh Zayed becoming Ruler of Abu Dhabi, with official celebrations deferred until later in the year.
August 15: Bahrain becomes independent.
September 3: Qatar becomes independent.
November 23-25: Meeting with Sheikh Zayed and Sheikh Rashid and senior British officials to fix December 2 as date of creation of the UAE.
November 29: At 5.30pm Iranian forces seize the Greater and Lesser Tunbs by force.
November 30: Despite a power sharing agreement, Tehran takes full control of Abu Musa.
November 31: UK officials visit all six participating Emirates to formally end the Trucial States treaties
December 2: 11am, Dubai. New Supreme Council formally elects Sheikh Zayed as President. Treaty of Friendship signed with the UK. 11.30am. Flag raising ceremony at Union House and Al Manhal Palace in Abu Dhabi witnessed by Sheikh Khalifa, then Crown Prince of Abu Dhabi.
December 6: Arab League formally admits the UAE. The first British Ambassador presents his credentials to Sheikh Zayed.
December 9: UAE joins the United Nations.
Honeymoonish
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BULKWHIZ PROFILE
Date started: February 2017
Founders: Amira Rashad (CEO), Yusuf Saber (CTO), Mahmoud Sayedahmed (adviser), Reda Bouraoui (adviser)
Based: Dubai, UAE
Sector: E-commerce
Size: 50 employees
Funding: approximately $6m
Investors: Beco Capital, Enabling Future and Wain in the UAE; China's MSA Capital; 500 Startups; Faith Capital and Savour Ventures in Kuwait
Hotel Silence
Auður Ava Ólafsdóttir
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Liverpool's all-time goalscorers
Ian Rush 346
Roger Hunt 285
Mohamed Salah 250
Gordon Hodgson 241
Billy Liddell 228
GAC GS8 Specs
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Who's who in Yemen conflict
Houthis: Iran-backed rebels who occupy Sanaa and run unrecognised government
Yemeni government: Exiled government in Aden led by eight-member Presidential Leadership Council
Southern Transitional Council: Faction in Yemeni government that seeks autonomy for the south
Habrish 'rebels': Tribal-backed forces feuding with STC over control of oil in government territory
From Zero
Artist: Linkin Park
Label: Warner Records
Number of tracks: 11
Rating: 4/5
Profile of Tarabut Gateway
Founder: Abdulla Almoayed
Based: UAE
Founded: 2017
Number of employees: 35
Sector: FinTech
Raised: $13 million
Backers: Berlin-based venture capital company Target Global, Kingsway, CE Ventures, Entrée Capital, Zamil Investment Group, Global Ventures, Almoayed Technologies and Mad’a Investment.
