Coach Ron Rivera said Monday that Gibson (calf) underwent an MRI, Nicki Jhabvala of The Washington Post reports.
Gibson sustained a calf injury late in Sunday's Week 6 loss to Kansas City, and the results of his exam should help determine the extent of the issue. The 23-year-old rushed 10 times for 44 yards while hauling in two of three targets for no yards prior to his exit Sunday, and J.D. McKissic is in line for additional work if Gibson is forced to miss time.
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Carter caught his lone target for six yards in Sunday's 17-15 win over the Raiders, playing 49 of 67 snaps (73 percent) on offense.
Humphries caught four of five targets for 38 yards in Sunday's 17-15 win over the Raiders.
McLaurin caught three of five targets for 22 yards in Sunday's 17-15 win over the Raiders.
Gibson carried the ball 23 times for 88 yards and caught five of six targets for 23 yards and a touchdown in Sunday's 17-15 win over the Raiders.
Heinicke completed 23 of 30 passes for 196 yards and two touchdowns with one interception in Sunday's 17-15 win over the Raiders.
Thomas "likely" tore his ACL and MCL during Sunday's victory over the Raiders, Adam Schefter of ESPN reports.
Thomas has been ruled out of Sunday's game at Las Vegas due to an ankle injury.
Seals-Jones (hip) is inactive for Sunday's game against the Raiders.
Samuel (groin) is active for Sunday's game against the Raiders.
Coach Ron Rivera suggested Smallwood could be called up from the practice squad to replace J.D. McKissic (concussion) as Washington's passing-down back Sunday against the Raiders, Matthew Paras of The Washington Times reports.