Chelsea academy defender Bashir Humphreys is joining 2. Bundesliga side Paderborn on loan until the end of the season.
Humphreys, 19, has been regularly involved in first-team training sessions under Graham Potter and made his senior debut for Chelsea earlier this month at centre-back alongside.
Arsenal have joined Chelsea in the race for a suddenly available midfielder, while the Blues are preparing to allow three of their recent signings to leave.