Jadon Sancho, who moved from Manchester City to Borussia Dortmund this summer, is still waiting to make his debut for his new side.
The 17-year-old was not named in Dortmund's 25-man Champions League squad, and neither can he play in the Bundesliga.
The youngster is still waiting for FIFA to confirm his registration, understood to be delayed due to his young age and FIFA's extra requirements when it comes to cross-border moves for minors.
Borussia Dortmund are said to be relaxed about the situation, with Sancho playing for the under-23s so far.