Borussia Dortmund has agreed to a deal to sign teenage defender Marian Sarr from Bayer Leverkusen's reserve team.

Sarr earned a spot on the Leverkusen reserve side this season and has appeared in 10 games before uncertainty over his future brought an end to a place in the team in November.

The 17-year-old arrived at Leverkusen from Schalke in 2008 and had been considered one of the better players in Bayer's youth system.

He will now move to Dortmund for an undisclosed fee in January.