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Ronald Koeman, Barcelona's boss, guided his team to third place in La Liga last year
After a disappointing draw at Cadiz, Ronald Koeman was under increasing pressure.
Frenkie De Jong's red cards saw the visitors play the final 25 minutes with 10 men. Koeman was dismissed in the dying seconds of the match for his dissent.
As speculation grows about Koeman's future, Barcelona has now won just two matches in La Liga.
Memphis Depay was closest to Barca's goal, miskicking just yards away.
It could have been worse for the visiting team, who were lacking in creativity. Marc-Andre Ter Stegen was required to make several outstanding saves at the end.
Koeman was furious at De Jong's two yellow cards within four minutes of the break. Cadiz created numerous late chances for victory, after having defended well for the majority.
Ter Stegen denied Alvaro Negredo and Salvi Sanchez, while Depay wasted many good chances for a Barcelona team lacking in fight but high quality.
Koeman was frustrated and sent to the sidelines after he argued against Sergio Busquets' late booking.
Koeman said that Spain sends you off for free. They don't tell you why they do it, they just have an attitude. Everyone was there when the second ball hit the pitch. Everybody has to see it.
"I am strong, of course. I cannot win the battle against the media. I will focus my energy on the team and the players. The players have a great attitude, which I find most important. I cannot stop reading what the media is writing. It is our job to keep going, it is our job."
After a start to this season that saw the Catalan giants lose three of five league games, and then losing 3-0 to Bayern Munich in the Champions League group stage game, the pressure is mounting on Koeman.
The club's financial woes have not helped the ex-Barcelona midfielder Lionel Messi, who left the club in summer. This has left the manager with an inexperienced team.
Gavi, a seventeen-year-old midfielder, was made his full Barcelona debut. Yusuf Demir (18) continued in attack.
However, the 58-year old's relationship has been strained with Joan Laporta, club president, in recent weeks. There is speculation that replacements are being looked at.
Player reaction: "We have a team that can fight for the league."
Sergi Roberto, Barcelona midfielder: "Here we must try to win La Liga. I don't believe it's okay to finish in the top 4!
"We have a team that can fight for the La Liga title, and I don’t believe any other side has better squads than we. We must get in gear and win.
Gerard Pique, Barcelona's defender: "I said it is what it was because we have four absentees at the top.
"I also stated that we would end up competing. I am not wearing the Barca shirt because I want to be second or third. I'm here for titles, and I'm 100% certain that, despite our poor start, we will compete. We need our fans to support us."
