The Blues defender has been on loan in the Bundesliga and any move has been delayed until he makes a full recovery from a knee problem
Chelsea have put discussions over the future of Baba Rahman on hold until late July following his return to the club, Goal understands.
Rahman spent last season on loan at Schalke, but his time in the Bundesliga was disrupted by an anterior cruciate ligament injury suffered at the African Cup of Nations.
The Ghanaian full-back is expected to be fully fit by the end of July and will be well placed to re-open discussions on his future but Schalke have decided against pushing for a renewal at this stage due to his injury status.