Thornton was reinstated to the 49ers' active roster Monday, Field Yates of ESPN reports.

After announcing his retirement last August, Thornton now rejoins the 49ers on the first day of their offseason program. The 30-year-old has spent time with the Eagles, Cowboys and Bills across seven seasons, appearing in 89 career games with 48 starts, 278 tackles and 7.5 sacks. He projects to compete for a depth role at defensive tackle this offseason.

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