and maintain their place at the top of the Scottish Premier League.

The Parkhead club's Europa League hopes are hanging by a thread after the goalless draw with Hamburg at the Nordbank Arena on Thursday night.

Tony Mowbray's side are bottom of Group C with two points from four games, five points behind second-placed Hamburg and to qualify now need to win their two remaining games in December against Hapoel Tel Aviv and Rapid Vienna and hope the Bundesliga side lose both their fixtures.

Caldwell says the Hoops have not given up on their European hopes and they will look to shrug off their frustrations in Germany by forging on with their bid to wrest the SPL title back from Old Firm rivals Rangers.

"We have left ourselves with a lot to do because of the bad start to the Europa League campaign but anything is possible in football," the Scotland defender said.

"I think we can take a lot of heart from the performance against Hamburg, there are obviously areas where we need to be better but we have to build on the performance.

"We created better chances on the night than they did although they were better than us on the ball and probably had more of the game.

"But if you miss chances it's going to cost you. However, we will keep working at it and now we have to put it behind us for Falkirk.

"We understand that playing in Europe is tough but we have to recover and come out again fighting on Sunday.

"We've done that over the last few years and we know what it takes but Falkirk will be a tough game.

"We are usually massive favourites in SPL games and we are always under pressure and that's what we have to live with at Celtic.

"We will respect Falkirk but I'm sure we will be ready for them."

Celtic's German defender Andreas Hinkel insists there will be no problem moving from the splendour of the Nordbank Arena to the more spartan environs of the Falkirk Stadium.

"It is always like that as a professional player," he said. "It doesn't matter if you play for Celtic, Hamburg or Stuttgart. If you play in the Champions League or the Europa League then the next game is usually against smaller sides but you have to handle it.

"It is not easy, it is not easy at all to win in the SPL. It will be a hard fight against Falkirk and we have to be concentrated again. But nothing else but a win will do for us."