No, not Germany, though this is where he spent his formative years after his family moved here as dad Rene kept goal for Sachsen Leipzig. More significantly, it's a return to the threshold of Celtic's first team. Pre-season opportunity has knocked, and the young Czech has tried his best to answer.
Two years ago, it was games against Arsenal and Lyon which led to him stepping up from Celtic's youth team. He acquitted himself well but just as found himself dropping down the levels. Hearing Neil Lennon single him out for praise following his accomplished 90 minutes in Tuesday's pre-season friendly against Augsburg, therefore, was never going to inflate the ego of the 19 year-old.
Twardzik will wait to see what happens when the games get serious at the end of this month before he permits himself to believe he has finally made the leap from project to first-team player. "I played in the Emirates Cup against Arsenal and Lyon," he said. "The gaffer told me I played well, but didn't think I was ready yet. I'm now getting the chance and hope to move forward and take a lot from this experience."
The remainder of the matches on this tour, followed by home friendlies against Norwich City and Internazionale, will allow both him and his manager a chance to assess progress.
An impressive debut against Kilmarnock the day Celtic clinched the title in April gave supporters an inkling of what he has to offer. However, Twardzik, like his twin Patrik, whose career path at Parkhead has been blocked by a succession of injuries, remains acutely aware that many rising stars have flitted across the horizon in pre-season, only to vanish from sight when the real action begins.
"The manager is very happy with me," he said as he reflected on his performance on the left of a back three against Augsburg. "If I do well, then I should get more games. If he's happy then, hopefully, I will continue to get a chance."
Celtic's first competitive game is only three weeks away, and will be in the third qualifying round for the Champions League. "I don't think about that game," added Twardzik. "Maybe I can get a few minutes, but I don't think I will start."
Even if the qualifiers come and go without Twardzik's name appearing on a team sheet, time is very much on the side of the player who moved to Glasgow along with his twin a week before they celebrated their 16th birthdays. He has ambition, but it is rooted in reality, and the teenager – identified two summers ago by Lennon along with James Forrest and Thomas Rogne as kids expected to make the breakthrough – appreciates his position. "I want to get more games and to play well when I get my chance. I feel ready to play in the first team, and I will do my best for the team."
Comfortable playing at the back or in midfield, he added: "Internationally, I play centre-half and here the gaffer wants me to play in midfield or centre half."
Almost a full team of players have been shipped out of Parkhead over the summer, with more to follow. However, Twardzik – recruited from Hertha Berlin's youth set up in 2009 – is pragmatic when assessing the situation in relation to youngsters like him.
"It doesn't change the team that much because a few players will come in to strengthen us," he added. "There is still a lot of competition. We have boys like Tony Watt, but in front of him there is Gary Hooper and Anthony Stokes."
If he succeeds, he hopes in tandem with his twin brother, it will make their decision to uproot from Berlin and begin a new life in this country all worthwhile.
"Celtic have progressed us well," he said. "We knew we could both make it if we play well. My mum moved over for the first five months, but then she went back home to my dad, who is a goalkeeping coach of Carl Zeiss Jena in the Third Bundesliga. Patrik is with the second team now. He's been injured and hasn't had much luck, but I think this season he can turn the corner. Then, who knows?"
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