The German club are considering bringing the left-back back to the Veltins-Arena as he continues his rehabilitation with the Blues in London
Baba Rahman could return to Schalke on loan at the end of August as the German club monitor his recovery at Chelsea ahead of the new season, Goal understands.
The Ghanaian needed surgery after he suffered an anterior cruciate ligament injury last season at the African Cup of Nations against Uganda.
Chelsea have had meetings with the full-back as he steps up his training with ball work at Cobham Training Centre and will consider an approach from the Bundesliga club, so he can get back to his best.