Germany boss Joachim Low is worried that Bastian Schweinsteiger will sign off his international career in front of a disappointing crowd next week.
The Mannschaft will take on Finland in a friendly match at the Borussia Park in what will be the Manchester United midfielder's 121st and last outing for the senior national side.
Less than half of the 43,000 tickets were reportedly sold by Monday, with Low blaming the timing of the game for such a poor potential turn-out.
He said: "It's a bit of a pity for Bastian, if the stadium isn't sold out. It's a bit unfortunate: There were the European Championships, the Olympics and the Bundesliga has now begun.
"On top of that, the kick-off time is quite late and the pupils are back in school, but I hope that a few more fans will come."
Low, who admitted it was a good time for Schweinsteiger and teammate Lukas Podolski to hang up their boots, said that he will name Schweinsteiger's replacement as captain after the match with Manuel Neuer leading the race ahead of Jerome Boateng and Thomas Muller.
"For both, it was a very good time. Both have shaped the national team and in winning the World Cup, they have won the top title," he added.
"For both of them, it was the right decision to focus on their club teams and that was absolutely fine by me."