Signing the 23-year-old, however, will not be straightforward. His contract with Nottingham Forest runs until 2029, with no release clause. The English side are under no pressure to sell, and with Chelsea also showing interest ahead of the January window, it won't be easy for the Bundesliga giants to pull off a deal.
Still, Forest’s poor start to the season might change things. The team currently sit 17th in the Premier League with just one win, and the mood around the club has been tense. Nuno Espirito Santo was sacked after falling out with owner Evangelos Marinakis, and new boss Ange Postecoglou is already under pressure after failing to win any of his first six games in charge.