Tartt left Sunday's game on the first snap of the Lions' final drive. He went into the game with the shoulder injury and re-injured it. Tartt had five combined tackles against Detroit before exiting and had six tackles and a pass defensed against the Minnesota Vikings a week earlier.
The 49ers made Tartt a second-round draft pick out of Samford in 2015. He signed a two-year contract extension in April. The new deal will keep Tartt in San Francisco through the 2020 season.
Tartt's 2017 season was cut short by a broken forearm. He has registered 192 combined tackles, 3.5 sacks, 10 passes defensed, two interceptions, and a forced fumble in three-plus career seasons.
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