The 49ers are placing Williams (ankle) on injured reserve, Tom Pelissero of NFL.com reports.

This doesn't necessarily mean the injury is serious; the 49ers may just be glad to keep their 2017 fourth-round pick without having to use a spot on the 53-man roster. Initially hyped as a candidate to earn a major role, Williams struggled with ball security and learning the offense throughout training camp and the preseason, while undrafted rookie Matt Breida proved to be a quick study. Breida presumably will enter the season as Carlos Hyde's top backup, with Raheem Mostert holding the No. 3 spot on the depth chart. Williams is still an intriguing asset in dynasty leagues, as Hyde can become a free agent after the season.

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