Sendles-White was released by Swindon Town in May 2017 after making seventeen appearances.
The 23-year-old, capped a dozen times by Northern Ireland at under-21 level, started his career at Queens Park Rangers and has also had spells with Hamilton Academical and Mansfield Town.
He signed a one-year deal with the O’s in August after going through a long trial period in pre-season.
But he was never able to establish himself as a regular.
He went on to make fifteen appearances overall for Orient.