Pittsburgh is set to release Peterson, Adam Schefter of ESPN reports.
Peterson recorded two tackles (one solo) and an interception in Saturday's 34-11 win over Cincinnati.
Peterson compiled a career-high 66 tackles (56 solo) and 15 pass breakups -- including five interceptions -- while playing all 17 regular-season games for the Vikings in 2022.
Peterson had six total tackles in Sunday's win over Green Bay.
The Vikings and Peterson agreed to a one-year contract Wednesday, Chris Tomasson of the St. Paul Pioneer Press reports.
The Vikings activated Peterson (undisclosed) from the reserve/COVID-19 list Tuesday.
Peterson (illness) was placed on the reserve/COVID-19 list Monday, Ben Goessling of the Minneapolis Star Tribune reports.
Peterson (hamstring) was activated from injured reserve by the Vikings on Saturday.
Peterson (hamstring) has been designated to return from injured reserve Wednesday.