Mikael Lustig has previous when it comes to learning the hard way what it feels like to be on the end of a Cup shock.

His Celtic career has not been immune from hiccups in cup competitions – the Morton League Cup defeat under Neil Lennon still rankles – but it is a shock from his time in his native Norway that burns the most.

As Rosenborg chased an illustrious double, they were upended in the semi-final of the national Cup competition by second division, part-time minnows Follo and Lustig is keen to ensure he doesn’t ever repeat the experience.

Celtic begin their Scottish Cup journey tomorrow with a trip to Stranraer and Lustig has cautioned against the potential banana skin that lies in wait.

“We are big favourites but we if we don’t go in with a 100 percent attitude then it can be hard,” he said.

“We have to treat it like a normal game. The coaches have had a look at them and we will have a look at them tomorrow morning.

“I had a big one when we lost at home here to Morton. That was quite a big shock.

“But the biggest one was when I played for Rosenborg in the Norwegian Cup semi final. We faced a team called Follo, who were bottom of the second division and we lost. It was a massive opportunity to win the double and we didn’t do it.”

“We got off to a good start, scoring the first goal and we probably thought the game was over. But they scored a wonder goal in the last minute to take it to extra time and then we lost in extra time.

“The fans weren’t happy. We had one game to get to a final and Rosenborg had not won the double for many years, so that was a real big opportunity. It was tough.”

While Lustig can recall the disappointment that greeted the Morton defeat when Dougie Imrie’s extra-time penalty put Celtic out, the result itself slipped under the radar somewhat because the club were successful on other fronts.

They were still competing in the group stages of the Champions League – they hosted Barcelona exactly a week later – and the progress made in Europe inoculated Lennon’s side from a raft of criticism that might otherwise have come their way.

There is no such lifeboat now.

Anything other than a professional and strong display will be met with disgruntlement given the nature of this season, something Lustig accepted.

“If you don’t score, the longer it goes on it can take only one touch and they got a penalty in that game for a handball,” said Lustig. “These things can happen.”

“At that time [Morton defeat in 2013] we had Europe to focus on and we did really well that season. But now we are out of Europe and we are focused on domestic football. If we go out, we are going to be really disappointed.”

Last season Celtic were aggrieved at a perceived injustice in the semi-final of the Scottish Cup Final when they felt a wrong decision at Hampden denied them the chance of a Treble.

However, while Lustig is eyeing up a clean domestic sweep again this term, he has insisted that there is no simmering anger fuelling that particular ambition.

The last time Celtic won a Treble – season 2000/01 – the Scottish Cup journey also started in Stranraer, a portent Lustig would like to envisage of what is to come.

“We want to win the Treble every year, but if the referee has made a mistake the season before, I don’t think the boys talk about it anymore. I wasn’t at the game. I’d just had an operation and was back in Sweden. I saw the game and saw the situation.

“Of course, we can win a Treble. We are favourites in all competitions and there are still plenty of games to go. You can see what can happen - a referee can make a mistake and everything can change. We can do something wrong as well, There’s a long way to go but we are aiming for that."

Logan Bailly will be between the sticks for Celtic as Craig Gordon is suspended, and Lustig has backed him to deal with his involvement professionally.

“He is a class goalkeeper and in the one game he has played against Dundee United he did well,” he said. “He’s been here a while now and it’s type of game he’ll want to play. It shouldn’t be any problem.”

Meanwhile, Lustig has been impressed this week with fellow Scandinavian Kristoffer Ajer. The 17-year-old has been training with the club and Lustig has been impressed with what he has seen of the 6ft 5in Norwegian.

“He looks good,” he said. “You forget he’s only 17 because he’s a big boy. He;s been with us for two training sessions and he’s done good. I don’t know him at all - when I was at Rosenborg he was probably 13 years old.”