The Raiders placed Martin on injured reserve Sunday due to a shoulder injury, Vic Tafur of The Athletic reports.
Coach Jon Gruden didn't acknowledge Martin's injury until Sunday, with the move to IR implying some degree of severity. After rushing for 723 yards in his first year with Oakland in 2018, Martin looked in line for the No. 2 role in the Oakland backfield behind Josh Jacobs, but he'll now be sidelined for at least the first half of the upcoming campaign. If the Raiders are comfortable with Jalen Richard and DeAndre Washington as depth options behind Jacobs, it's possible Martin receives an injury settlement that would allow him to pursue work elsewhere.