Ronald Koeman has demanded Barcelona's attitude in away matches improve after they went down 2-1 to Cadiz in La Liga.
Barca had lost just one of their previous eight fixtures in all competitions heading into Saturday's clash with Cadiz, who had already claimed the scalp of champions Real Madrid this term.
The only defeat in that run came at the hands of Atletico Madrid in Barca's last away outing in La Liga, however, and their poor form on the road under Koeman continued as Alvaro Gimenez and veteran forward Alvaro Negredo clinched another famous win for Cadiz, who had just 17.9 per cent possession.
Cadiz moved up to fifth, while Barca sit 12 points behind leaders Atleti, who overcame Real Valladolid 2-0, with their tally of 14 points from 10 league matches their lowest since 1987-88 when adjusted to three points for a win.
Barca had 21 attempts, though only eight hit the target, and Koeman's side had to rely on an own goal from Pedro Alcala to get on the scoresheet.
The Blaugrana have failed to win four straight away La Liga games (D1 L3) for the first time in a single season since 2007-08 under Frank Rijkaard.
The result was one that Koeman planted firmly on his players, insisting that Barca's attitude on their travels has not been up to scratch.
"We can't concede a second goal like that. It's a lack of concentration," Koeman told Movistar of Negredo's goal, which came when he charged down Marc-Andre ter Stegen after Clement Lenglet failed to control a throw-in.
"It's hard to explain what happened because we had a good week. I think the first half wasn't good. We lost a lot of balls. There was a little improvement in the second half.
"It's a giant step backwards to be able to compete for La Liga. I'm very disappointed. There are many points dropped away. If we do not improve the attitude away from home, there is nothing else to say.
"We have ups and downs in our games, in our attitude, although in principle it is good, but there are moments that it is not. When we don't have the ball, we fail a lot. This is an attitude [problem] of the whole team."
Barca have conceded first in their past four away league matches, a trend which concerns Koeman, who claimed his team are letting in the types of goals his former clubs have not.
"In away games they put us behind and that's more complicated," he continued.
"We don't have spaces to play and also, and we have to know this, we conceded goals that I couldn't think of happening in other teams that I have coached.
"It is very difficult to explain, it may be because we lack concentration, we lacked aggressiveness, but it is not easy to explain how we conceded the second goal."
Next up for Koeman is a home clash with Juventus in the Champions League, though both sides have already qualified for the last 16.