Borussia Dortmund has been allowed to play Youssoufa Moukoko due to a change in the minimum age rule for Bundesliga clubs.
Moukoko, 15, has scored 34 goals in 20 matches for Dortmund's under-19 side while also adding nine assists.
Under previous rules, Moukoko would be ineligible to play until August 2021 but he will now be able to play in November.
“We are very pleased with this decision,” the Dortmund academy director, Lars Ricken, told Kicker. “This could help the clubs but also the young players in their development. A majority of the clubs want to be able to give outstanding talents, on very rare occasions, the chance to take the next step in their development.”