The Ghanian defender spent last season on loan at Schalke after falling out of favour under Antonio Conte during the last pre-season campaign.
The defender returned to the club after rupturing his cruciate ligament, which saw his loan spell end prematurely.
Despite looking like an ideal fit for Conte’s system, Rahman does not appear to be in the Italian’s plans going forward.
Chelsea are in the market for a new wing-back while Rahman continues his recovery.
Heidel has confirmed that a move for the defender will come down to when the player is expected to return to full fitness.
We are in talks with the player, his agent and Chelsea. Ultimately, it is about when Baba will be able to play again. No decision has been made yet.