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Mattison profiles as Zamir White's top backup at running back, Tashan Reed of The Athletic reports.

Following the free-agent departure of Josh Jacobs, White is the team's presumed lead back and figures to handle the bulk of the carries, likely leaving Mattison without much fantasy value unless the 24-year-old suffers an injury (or struggles and eventually gets benched). Meanwhile, Reed indicates that Ameer Abdullah and rookie Dylan Laube are still competing for third-down RB duties, although Mattison handled some of those snaps with the first-team offense in Vegas' preseason opener against Minnesota.

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