Borussia Dortmund's goalkeeping star, Gregor Kobel, caught the eye of Chelsea last season, according to Bild.
Chelsea will face Shamrock Rovers on Thursday night in their final Conference League group-stage match, with manager Enzo Maresca set to make key selection decisions.
Chelsea manager Enzo Maresca has provided updates on Joao Felix and Romeo Lavia as the Blues prepare for Thursday's Conference League clash against Shamrock Rovers.
Chelsea have booked their place in the UEFA Conference League last 16 with an impressive 3-1 victory over Astana in freezing conditions in Almaty, Kazakhstan.
Chelsea's 18-year-old defender Josh Acheampong is set to start against Astana in the Europa Conference League on Thursday, following significant progress in contract negotiations.
Tottenham manager Ange Postecoglou remains confident he can revitalise the team's fortunes despite a dramatic implosion against Chelsea in the Premier League on Sunday.