Celtic defender Efe Ambrose is determined to atone for his own goal against Dundee United when Barcelona visit Parkhead tomorrow night (Live on RTÉ Two and www.RTÉ.ie/sport).
The Nigerian has impressed since arriving from Israeli club Ashdod in August but he gifted United a Clydesdale Bank Premier League point on Sunday when he headed past Fraser Forster in injury-time as Celtic threw away a 2-0 lead.
Ambrose said: "For me, after scoring the own goal, what went through my mind was that I let the team down and I let myself down too. I should have done better with the ball but I didn't.
"But that is football, that is part of the game, and the important thing is how you move on and how you react to situations like that.
"It was my first own goal of my career and now I want to pay back the Celtic fans.
"Yes, it was very disappointing, but we have recovered and it is behind us now.
"It was my first own goal of my career and now I want to pay back the Celtic fans" - Efe Ambrose
"We conceded two goals in two minutes, which is not good enough, and we have to take full responsibility for that and hope that these kind of mistakes never happen again."
Celtic sit second behind Barcelona in their Champions League group but they could have been hosting the Catalans undefeated had they defended another injury-time cross in the Nou Camp.
And Ambrose is determined to make sure there is no late slackness in the return fixture.
He said: "The last game was hell for us in the Nou Camp because we fought until the last minute before Barcelona scored their winner.
"It's very worrying that we've lost our concentration so late in these matches.
"In the Nou Camp, it was the 94th minute and then at Tannadice it was two late goals in two minutes, so we need to sort that out.
"We've talked about it with the manager and we know what we need to do - and we will do it.
"At a time like this we need to be more focused and go to the last minute and keep our concentration until the very end. We need to put effort in to make sure this does not happen again."
Meanwhile, Emilio Izaguirre has been ruled out for six weeks with a hamstring injury.
The Hoops left-back came off during Sunday's match and Thomas Rogne is out for two weeks with a calf complaint picked up in the same game.