CEO Jed York, GM John Lynch and head coach Kyle Shanahan said in a team statement that "Foster will not participate in team activities as he is tending to his legal matters. As previously stated, his future with the team will be determined by the information revealed during the legal process."
Foster, 24, was charged with multiple domestic violence and weapons counts last week in connection with a February arrest. Foster was initially facing one misdemeanor count of possession of a large capacity magazine, but prosecutors dropped the charge Monday in light of a higher court injunction prohibiting the enforcement of the charge.
It was a mutual decision by the Niners and Foster that he remain away from the team for the start of the offseason program, according to NFL Network's Jim Trotter. The team is expected to meet with Foster and his representative this week. At this point San Francisco does not have a defined plan for how to give Foster structure while away from team activities, per Trotter, but that is something the 49ers hope to finalize when meeting with Foster.
In addition to the criminal charges, Foster is subject to potential NFL discipline under the league's personal conduct policy, which mandates a six-game suspension for a first-time domestic violence offense. Trotter reported last week the league won't consider putting Foster onto the Reserve/Commissioner Exempt List until it concludes its investigation into the matter.
The 2017 first-round draft pick out of Alabama started 10 games as a rookie, tallying 72 tackles.