Cause for concern? Patriots left tackle Trent Brown not at practice

Brown had surgery on his right shoulder last December but made a full recovery and was healthy throughout the preseason.

Trent Brown (right) runs through a drill with Frank Herron during Patriots Training Camp at Gillette Stadium.
Trent Brown (right) runs through a drill with Frank Herron during Patriots Training Camp at Gillette Stadium. –Jessica Rinaldi / Globe Staff

FOXBOROUGH — Patriots left tackle Trent Brown walked through the locker room wearing a smile and an AC/DC T-shirt Sunday morning but he was the lone absence from the team’s practice that afternoon.

Brown had surgery on his right shoulder last December but made a full recovery and was healthy throughout the preseason. If he does not return to practice soon, it would be cause for concern, given the strength of the Texans’ pass rush the Patriots will be facing on Sunday.

In potentially better news for the offensive line, though, right tackle Marcus Cannon practiced on Sunday.

Scarnecchia said the plan was for Cannon to do individual drills at least and probably some 1-on-1 work, adding that the team hopes to have him available for Week 1. Cannon missed the preseason with a leg injury.

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“We feel like he’s been very close to being good, and whether or not that continues, we’ll just have to see,’’ Scarnecchia said. “He’s in that process now.’’