Media reports claim that Dortmund are keeping tabs on Elias Niklas Baum, who currently plays as a defender for Frankfurt. The move is still in the early stages, but interest appears to be growing. Augsburg, Hamburg and Heidenheim may look to intervene if talks continue without resolution. With only 25 goals conceded in 24 (1.04 per game), Dortmund have been one of the stronger defences in the Bundesliga this season.. Elias Niklas Baum would be asked to keep that standard and provide dependable cover when needed. Alongside this, Frankfurt are said to be exploring Raphael Onyedika Nwadike with Dortmund likewise connected to Ethan Nwaneri, Konstantinos Karetsas and Said El Mala. Can't get enough Dortmund transfer rumours? Follow @PlayerSwitchCom on Twitter for the latest transfer news as it happens.