The 19-year-old frontman has risen through the Academy ranks at the Madejski Stadium and made his first-team debut in December 2012 as a substitute in a Premier League clash at Sunderland.
That remains his sole senior appearance to date for the Royals although he also enjoyed a brief loan spell at Colchester last season, making two starts in League One.
Samuel, who has represented England at Under-19 level, is available to make his Daggers debut in Saturday's League Two clash at home to Fleetwood.
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