The Tricky Trees have been one of the busiest sides in terms of recruitment in the ongoing window with supremo Evangelos Marinakis backing boss Steve Cooper ahead of their first season back in the Premier League.
Cooper has been looking to bolster his midfield this summer and they have identified Stuttgart man Mangala as a target.
Nottingham Forest have been in talks with Die Roten over a move for Mangala since Friday and have made some progress.
According to Sky Deutschland, the Nottinghamshire giants are closing on snapping up the 24-year-old having reached an agreement with Stuttgart for his services.
Nottingham Forest are ready to fork out €15m including bonus payments for Mangala although the terms of a deal are yet to be written down.
The Premier League new boys and Stuttgart are still discussing the finer details of a swoop for the midfielder and there is still an outside chance of the move falling through.
Nottingham Forest have already added three players from Bundesliga outfits to their ranks this summer and Mangala is now close to being their fourth recruitment from Germany.
