48 Fred Warner LB

Warner started at middle linebacker and racked up 12 tackles (11 solo) in Sunday's loss to the Vikings.

Warner was the only defender for either side to reach double-digit tackle totals Sunday. The third-round pick is filling in for Reuben Foster (suspension) at middle linebacker for the first two games of the season, but his polished play should keep him in the starting lineup at one of the outside linebacker positions even after Foster returns Week 3, making him a strong IDP asset to begin the year.

Warner did not practice Sunday due to a chest injury and is considered day-to-day, Nick Wagoner of ESPN.com reports.

It's unclear exactly when Warner suffered the injury, but it doesn't seem to be too serious given that he's being evaluated on a day-by-day basis. Warner was selected by the 49ers in the third round of this year's draft and is expected to contribute immediately at linebacker in San Francisco.