Neil Lennon blamed himself for starting with the wrong tactics after Celtic went down 1-0 to Hibernian in their Clydesdale Bank Premier League clash at Easter Road.
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The Hoops boss started with a back three of Efe Ambrose, Thomas Rogne and Kelvin Wilson but changed it to a back four after Leigh Griffiths rounded Parkhead goalkeeper Fraser Forster after eight minutes before scoring the winner from an acute angle with his 14th goal of the season.
The visitors dominated almost totally thereafter but huffed and puffed when not being denied by Hibees keeper Ben Williams.
Afterwards the Celtic boss, whose side had won their previous six games, said: "Frustration is the key word. First of all I would like to say it was a great atmosphere and a great game, played in a great spirit.
"But I am not disappointed in our performance at all. I am disappointed with the goal, obviously, and I am disappointed with my own formation, which I changed, so I will take the blame for that.
"We had two formations set up and I chose the wrong one by the look of it.
"The three didn't really work for us today and once we went to a flat back four we were more in control and for 70 odd minutes we dominated the game.
"I was disappointed with the final ball and composure in front of goal but on another day we would have won the game comfortably.
"So in terms of attitude, desire and intensity I can't fault the players at all.
"It was there for all to see, we just lacked the edge in front of goal today and the lack of bodies in the box was apparent.
"There is no excuse. I am not making excuses today, I am pretty pleased with the way we played.
"I don't like losing as you know but there is a way of losing I suppose when you are having a go for 70-odd minutes, that's the way to lose."
Hibs had picked up only four points in their previous seven games before battling to their first victory over Celtic at Easter Road in four years.
Pat Fenlon claimed it was his best result since taking over as manager just over a year ago as he looked forward to the Edinburgh derby against Hearts in the new year
The Irishman said: "That's probably the biggest win since we've been here. To beat Celtic is fantastic achievement, after the run they have been on of six or seven wins and after qualifying for the last 16 of the Champions League, it is a big result.
"The win against Hearts a few weeks ago was a massive result and I think the players will take a lot of confidence from this result.
"It will give the players a lift (ahead of the Hearts game).
"I think over the last three or four weeks, people have started to doubt us a little bit so we have answered a few critics so we are delighted.
"We scored a very decent goal and probably could have scored again before half-time.
"It was a great finish, he still had a lot to do when he went round the keeper.
"Celtic put us under pressure with a lot of balls into our box but I don't think they carved us open or created too many chances."