Starts in preseason opener
Mack carried the ball three times for six yards in Saturday's 17-13 preseason win over the Saints.
Mack drew the start at running back with the Texans' first-team offense on the field for the opening two series, but only one of his three carries went for more than three yards as the unit struggled to move the ball early. Rookie fourth-rounder Dameon Pierce eventually impressed as he paced the backfield with five rushes for 49 yards while Mack looked on, which could help the former earn some run with the ones this coming Friday against the Rams. However, Mack remains atop the depth chart at running back for the time being.
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Gray didn't practice Thursday due to a hip issue, Eric Branch of the San Francisco Chronicle reports.
Mack was only on the field for three special teams snaps in Sunday's 11-10 loss to Denver.
Mason received one carry for seven yards in Sunday's 11-10 loss to Denver.
Jennings had one reception (three targets) for five yards in Sunday's 11-10 loss to Denver.
Aiyuk caught three of eight targets for 39 yards and a touchdown in Sunday's 11-10 loss to the Broncos.
Kittle (groin) hauled in four of five targets for 28 yards in Sunday's 11-10 loss to the Broncos.
Wilson rushed 12 times for 75 yards while adding three receptions for 31 yards in Sunday's 11-10 loss to Denver.
Samuel caught five of eight targets for 73 yards and rushed five times for six yards in Sunday's 11-10 loss to Denver.
Kittle (groin) has been cleared for Sunday's game against Denver, avoiding a designation on the 49ers' final injury report, Nick Wagoner of ESPN.com reports.
Kittle (groin) was limited at practice Thursday, Matt Maiocco of NBC Sports Bay Area reports.