Alba said the players are to blame after their title hopes officially ended with Sunday's 2-1 defeat to Celta Vigo.
"The first half was very good, they hardly got into our half and then get a goal from outside the box," Alba told Movistar.
"We had the game under control, we were creating chances. The second half was not so good.
"Celta are a team that play good football. It was tough and their second goal was bad luck."
Alba lamented Barça's poor run of just one win in five games to end the season.
"We have to give value to the Copa del Rey but it's true that it's now a lot of games without winning," he added.
"We depended on ourselves, we'd done the hard work, cutting back all those points, and we didn't then take advantage by going top."
On the team's struggles in the second half, Alba said the players are at fault, not the coach.
"The players, we're to blame when things go badly," the defender said.
"We tried today, above all in the first half, but Celta are a good team and it was hard. That's football. It's a shame to lose."
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