Marc-Andre Ter Stegen has implored his teammates to forgive him for the errors that led to his team losing 4-3 to Celta Vigo.
The first 45 minutes saw Barcelona go 3-0 behind at Balaidos, with the opening goal due to the the German making a failed clearance.
And despite a Pique header and a Neymar penalty, Ter Stegen attempted to clear a Jordi Alba back pass, but sent it straight at Hernandez’s head.
The ricochet ended in the back of the net with 13 minutes left to go, and Barcelona had no response to it.
“We fought until the end, but the goal is my fault – I am really sorry for the team for what happened,” the Germany international told beIN Sports.
“Clearly I want to make a pass to Jordi. It is a failure that cannot happen and again I’m sorry for the team, who fought until the end. If I had not made this decision we may have won and this was clearly my fault.
“Although this has happened I will not change my game. It has only happened once.
“It’s a defeat that hurts, but we must continue. Now comes the international break and then we will try to follow the path we were on before. We must get up and go on.”
Defender Pique was keen to forgive Ter Stegen, agreeing the shot stopper should not alter his ball-playing style and attempting to remain positive despite the loss.
He said: “Could Marc have risked less? Yes. But the way he plays gives us so much and often they [the risks] are good for us. He should continue [playing like that].
“With nothing to lose, we played well after the break and we almost did it. I prefer to highlight the team’s reaction.”
Barca are fourth in the table at the international break, two points behind leaders Atletico Madrid.