Coach Kyle Shanahan admitted he is concerned about the future of Reuben Foster after the linebacker was arrested twice shortly after his rookie season. “Yeah, any time you’ve gotten in trouble, whether – we’re talking about a case and I’m not sure whether anything’s going to happen or not – but if any of that stuff does come out, you’re subject to being suspended from the league,” Shanahan said Thursday at the NFL Scouting Combine. Approximately a month after Foster was arrested in Alabama for possession of marijuana, he was arrested in Los Gatos on charges of domestic violence, threats and possession of an assault weapon. The Santa Clara County District Attorney’s office is reviewing Foster’s case to determine if there is enough evidence to file criminal charges. Foster is also subject to an NFL suspension under the league’s policies on personal conduct and substances of abuse.