The 21-year-old completed his move to the English Champions after the club announced his signing on Sunday having sealed a five-year deal with Club.
The highly-rated defender will thus be in a shirt which was initially worn by Belgian international Eden Hazard.
Rahman is expected to step into Jose Mourinho’s set up following the team’s floppy display at the back in recent games.
The former Ghana U-20 left-back is however expected to be unveiled today to begin his new career with the blues.
The Ghanaian international could be making his debut on Saturday when the team travels to face West Bromwich Albion.