Pittsburgh Steelers linebacker T.J. Watt left the first half of Sunday's defeat against the Las Vegas Raiders with a groin injury.
He didn't return for the second half after the Steelers downgraded him to out, leaving the Steelers without their best defensive player. The Raiders won, 26-17.
His long-term prognosis was not immediately clear.
Any time missed by Watt is a big blow for the Steelers. The runner-up for NFL Defensive Player of the Year last season, Watt was off to a hot start to 2021 prior to his injury.