The 19-year-old has two first team appearances to his name, both coming last season and will head to the Isthmian League South Central Division outfit in search of valuable game time.
A product of the Barnet FC Academy, Malakai joined Chelsea in 2014 but returned on Transfer Deadline Day last summer.
He also had a spell on loan at Southern League side Farnborough last season.
We wish Malakai the best of luck at Hanwell!
Current BFC loans:
Zak Jules – Shrewsbury Town
Manny Duku – Cheltenham Town
Fuad Sule – Larne
Roy Syla – Kings Langley
Fumnaya Shomotun – Wealdstone
Benjy Aghadiuno – Aylesbury United
Joe Payne – Wealdstone
Loic Hernandez – Wingate & Finchley
Nana Kyei – Concord Rangers
Malakai Mars – Hanwell Town