Boruc, who this week was omitted from the Poland squad for the World Cup double-header with the Czech Republic and Slovakia, still has almost two years left on his existing deal.

The 29-year-old has been linked with moves away in the past, including to the likes of AC Milan and Arsenal.

But he insists he is happy at Celtic, saying: "It is a great club to play for. Everybody knows how passionate the supporters and players are to win the league, so it is really good to be here. I am still really enjoying it.

Asked about a possible transfer, he added: "I don't know. We will see. I am not thinking about changing clubs.

"I am quite focused on Celtic just now. If they were to come up with a new contract, I would think about that."

Boruc suffered a major dip in form for both club and country last season as his personal life became headline news.

He said: "I am not a machine. Everyone makes mistakes and I am the same.

"But this is a new season, and I don't want to look back to the last one. I don't even want to mention it."

The keeper has shown few signs this term of the errors which blighted his game.

He said: "I can feel my form getting better, but it is not the best I can do.

"I still have some work to go. We will see what happens in the next few weeks."