As reported by Goal.com, the younger brother of English club Chelsea's star midfielder Eden, has scored 10 goals and made five assists in Bundesliga this season during 15 appearances in all competitions.
Thorgan left the London club in 2015.
'Life saver' Alisson, Salah sends Liverpool into last 16
Meanwhile, Chelsea are eyeing to bring in a replacement for ageing Cesc Fabregas in the form of Barcelone midfielder Denis Suarez, the Mirror reported.
The 24-year-old will cost the Blues nearly £15 million, and will prefer the move since he hasn't been able to lock a regular spot in the playing eleven.
Fabregas' contract with Chelsea expires at the end of the season, and the club believes Suarez will be an ideal replacement.
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