Spencer Ware (32) John Sleezer/Kansas City Star/TNS/Sipa USA

Josh Jacobs has not practiced this week, putting his availability for Sunday’s Raiders-Jets game in doubt. The Raiders are looking at a longtime Chiefs running back for potential insurance.

The Raiders hosted Spencer Ware on a Thursday visit, Field Yates of ESPN.com tweets. The free agent running back last played for Kansas City in December 2019, re-signing with the Chiefs during their Super Bowl-winning season. Ware, 29, has not signed with anyone this year.

Jacobs is battling an ankle injury sustained during the Raiders’ blowout loss to the Falcons. Devontae Booker has worked as his immediate backup this season and would start if Jacobs could not go Sunday. Las Vegas has passing-down backs Jalen Richard and Theo Riddick on its 53-man roster as well.

The Chiefs turned to Ware after Jamaal Charles went down in 2015. Charles’ immediate successor led the 2016 team with 921 rushing yards, earning a contract extension. But the Chiefs pivoted to Kareem Hunt in 2017 after a Ware season-ending injury, and Ware signed with the Colts in 2019. While he played in just three games last season, he averaged 4.8 yards per carry in 2018. A shoulder injury ended Ware’s brief Chiefs stint last season.

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