"The other day the point was different," he said, referring to the draw against Girona.
"Today we have no excuse because we played 11 against 11.
"We should have been solid but we have given chances away and it has cost us a lot.
"I am worried about conceding goals."
Gerard Pique has come in for criticism of late and he underperformed again for the LaLiga Santander champions.
"We are a team," asserted the midfielder. "We win and we lose together.
"We have to make an assessment as a team, we had eleven players out there and we all lost."