The 23-year-old, who has recouped from a knee issue, was additionally an objective for Everton and Inter Milan.
It will be Rahman's second credit spell in Gelsenkirchen, having burned through four months at Schalke toward the begin of last season.
The previous Augsburg protector cost Chelsea an underlying charge of £14million when he went along with them in 2015.
He highlighted in 13 Bundesliga diversions amid his first advance spell with Schalke.
Be that as it may, he has not played for Chelsea since coming back to Stamford Bridge.
He spent a lot of 2017 on the treatment table in the wake of anguish foremost cruciate tendon damage at the Africa Cup of Nations.
Miracle Bitrus
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