Nottingham Forest are said to be "big favourites" to sign Konstantinos Mavropanos amid competition for the defender’s signature.
Stuttgart are reportedly willing to let the centre-back leave this summer. In addition to the Reds, Premier League rivals Fulham, as well as Eintracht Frankfurt and Napoli, have been credited with an interest.
A bid of 10 million euros (£8.5m) was previously suggested as being in the offing by Forest. Mavropanos is said to have a release clause of 25m euros (£21m), but Stuttgart could let him go for 15-20m euros (£12.8-17m).