The Celtic goalkeeper endured a disastrous start to the season after he was banned for two games by Poland coach Leo Beenhakker following an alleged drinking session after a match in Ukraine.

He was also slapped with a £50,000 fine by Celtic manager Gordon Strachan before his howler in the opening Old Firm clash of the season allowed Kenny Miller to score.

Boruc is back in the Polish squad now preparing for their World Cup double-header against the Czech Republic and Slovakia. And the controversial keeper owned up to his Old Firm disaster, but maintained he has put it all behind him.

He said: "Everyone commits mistakes and I'm no different. I'm not a machine. Obviously, with what had happened, it was a bad time to make a mistake.

"It's fair to say I had some bad luck, it was a really tough time. But I have certainly not lost my form."

And Boruc even had time to joke about the mistake after being quizzed in a Polish newspaper about whether he will leave Celtic in January.

He said: "I don't know, £10million for a goalkeeper is still a lot of money. I even played badly against Rangers to try and get the price down! Although I guess it went back up again after the Villarreal match.

"The fact is I have no desire to leave Celtic and I have no regrets about being there."

Boruc accepted his two-match ban from Poland, along with two other players, although he is still angry about the circumstances leading up to it after a game in Lviv.

He said: "It was probably an appropriate punishment. I am not ashamed – I can't say we behaved well, but the fuss was all so unnecessary. The problem is that so few people knew what actually happened in Lviv.

"We made a bad error of judgment, but the coach didn't have to come to Scotland to talk to me about it. We could have come up with the same answers after talking for three-and-a-half minutes as three-and-a-half hours.

"But I'm finished talking about Lviv. That's in the past and I'm back in the squad now.

"I am only thinking about the future."