The Blues snapped up the left-back from Augsburg last summer, after he’d recorded the most tackles of any player in the Bundesliga during the 2014/15 campaign.
But the Ghana international struggled to impact last season as the west London club’s form tanked, called upon to make just eleven starts in the Premier League.
Yesterday afternoon, Schalke revealed via their official Twitter account that the 22-year-old had linked up with the first-team squad for their summer training camp.
And the much-speculated move has now been confirmed by Chelsea on their club website, with Rahman joining the Miners on a season-long loan.
Incredibly, he’s now the 15th Cheslea player currently out on loan, alongside Mitchell Beeney (Crawley Town), Andreas Christensen (Borussia Monchengladbach), Nathan Ake (Bournemouth), Tomas Kalas (Fulham), Wallace (Gremio), Victorien Angban (Granada), Matej Delac (Mouscron-Peruwelz), Charly Musonda (Real Betis), Jeremie Boga (Granada), Kasey Palmer (Huddersfield Town), Lewis Baker (Vitesse), Nathan (Vitesse), Joao Rodriguez (Santa Fe) and Alex Kiwomya (Crewe Alexandra).