The loss leaves Barca six points behind leaders Real Madrid.
"The players are fairly relaxed; we know that in our profession there are challenges, and that's exciting and we're fascinated by it. Happily, there's still a long way to go, and no cups have been awarded yet. One of the keys to this team is that we don't give up or throw in the towel - never," said Alves.
"We had our chances but we didn't take them, while they scored with the only shot they had on goal. There's no other explanation."