Barcelona fell to their first La Liga defeat of the new season last night in embarrassing fashion.
The Catalan club were completely outplayed by Celta Vigo, who ran out comfortable 4-1 winners on a disastrous evening for Lionel Messi and Co.
The defeat at the Balaidos was Barca's worst La Liga defeat in seven years and completely stripped all their good work from the 2-1 away win at title rivals, Atletico Madrid.
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Javier Mascherano believes the manner in which the Camp Nou outfit were swept aside last night is 'worrying'.
As per Sky Sports, the former Liverpool player said: "The opposition not only beat us, they also outplayed us, which is worrying.
"It always hurts when we lose. This is nothing new to us, we're seasoned veterans. The best thing to do is turn the page, focus on Saturday's game and putting in a good performance."
The defeat saw the defending champions surrender their early lead over both Madrid clubs and they now sit fifth in Liga BBVA, a point behind Real Madrid, Celta and Villarreal.
They have an instant opportunity to respond with newly promoted Las Palmas travelling to the Camp Nou on Saturday.
You get the feeling it could be a long afternoon for Las Palmas. The wounded animal of Barcelona will be looking for an emphatic victory to get back on track.
With Real Madrid making a strong start to the season under Rafael Benitez, the 23-time La Liga champions can ill afford to drop any more points.
It seems an unlikely prospect that Barcelona will lose at home, however, nothing can be taken for granted in a strong La Liga this season and the new boys will be no pushover.
Will Barcelona bounce back against Celta Vigo? Have your say below!