Team has a workout for Petrowski

Defensive end Ezekiel "Ziggy" Ansah worked out for the San Francisco 49ers on Tuesday, but left the team's facility in Santa Clara without a contract, according to Ian Rapoport of NFL Network. The NFL insider noted that the two sides were unable to agree on a deal. The #49ers visit with free agent pass-rusher Ziggy Ansah is over, source said. The two sides were unable to come to terms on a contract. Ansah will continue to wait for the right opportunity.— Ian Rapoport (@RapSheet)

San Francisco 49ers rookie defensive tackle Javon Kinlaw didn't walk away from his NFL debut with gaudy statistics. He was credited with just one tackle during Sunday's loss to the Arizona Cardinals. Still, Pro Football Focus graded the young defender as the fourth-best 49ers player from Week 1 and felt he had the third-best debut by an NFL rookie. NFL Media analyst Brian Baldinger was impressed by Kinlaw's performance against the Cardinals and shared a little film breaking down why he feels that way. He called the young defender an "incredible prospect with

San Francisco 49ers general manager John Lynch joined KNBR on Friday morning and provided several injury updates. Among them was news that cornerback Ahkello Witherspoon has cleared the concussion protocol and will start in place of Richard Sherman this weekend against the New York Jets. Sherman was placed on short-term injured reserve this week and will miss at least the next three games. Lynch did note that his calf strain is unrelated to his previous Achilles injury. The general manager saw Sherman after the game and noted, "It wasn't pretty the way he was walking." That, along with discussions with Sherman, led the 49ers to sideline the All-Pro cornerback for a few games. Witherspoon will fill in for the veteran cornerback and play