With the 49ers uncertain how much time rookie Reuben Foster will miss, the team reportedly brought in linebackers Sean Spence and Donald Butler for a workout on Tuesday.
News of the workouts was first reported by ESPN.
Spence, drafted by the Steelers in the third round of the 2012 NFL Draft, spent last season with the Titans. In 15 games, he recorded 35 tackles and three sacks.
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Butler is a six-year vet with 85 games and 67 starts under his belt. After five seasons with the Chargers, he played for the Dolphins in 2016.
The 49ers are looking for insurance while Foster recovers from a high ankle sprain. On Monday, head coach Kyle Shanahan was unsure when Foster will be back.
“Not exactly sure on the timetable. We'll see how long it takes him.We're going to put him in a boot for a little bit. But those tend to be a month or more. But I can't put an exact date on it," Shanahan told reporters.
Also on Tuesday, the 49ers released linebacker Ben Boulware from the practice squad and replaced him with defensive back Jarnor Jones.
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