The Raiders have placed McCormick (ankle) on IR.

McCormick (ankle) said Tuesday in a story on his personal Instagram account that he plans to "be back next season."

Raiders head coach Antonio Pierce said Wednesday that McCormick will start Monday's game against the Falcons even if Alexander Mattison (ankle) retakes the field, Paul Gutierrez of ESPN.com reports.

McCormick rushed 15 times for 78 yards and brought in two of three targets for 11 yards in the Raiders' 28-13 loss to the Buccaneers on Sunday.

McCormick is expected to work in a timeshare out of the backfield with Ameer Abdullah in Sunday's game at Tampa Bay with Zamir White (quadricep) ruled out and with Alexander Mattison (ankle) listed as questionable but considered unlikely to play, Adam Hill of the Las Vegas Review-Journal reports.

The Raiders signed McCormick off their practice squad Tuesday.

McCormick is active Friday against the Chiefs along with fellow RBs Ameer Abdullah and Dylan Laube.

McCormick was elevated from the Raiders' practice squad Thursday ahead of Friday's contest against the Chiefs.

McCormick reverted to the Raiders' practice squad Monday.

The Raiders elevated McCormick from the practice squad to the active roster Saturday.