49ers' Ahmad Brooks: Brooks is sidelined with an unknown condition

Brooks (undisclosed) has only been participating in walk-throughs during 49ers' OTAs, CSN Bay Area reports.

49ers defensive coordinator Jim O'Neil wouldn't disclose the nature of Brooks' injury, but said that he is "hoping that we can get something out of him by the end of spring." It doesn't sound like the injury is serious, and we will update his status as soon as more information is provided by the team.