49ers signed LB Blake Costanzo, formerly of the Bears. Costanzo, 30, played for the 49ers in 2011, racking up 12 tackles across 16 games. The pure special teamer has played just 61 defensive snaps the past three seasons.

Bears LB Blake Costanzo has undergone thumb surgery, but expects to be ready following Chicago's Week 6 bye. A core special teamer, Costanzo has four tackles in five games. An absence of any sort would make him a candidate for injured reserve, but it sounds like he won't miss any time.

Bears signed LB Blake Costanzo, formerly of the 49ers, to a two-year contract. A special teams ace, Costanzo helped anchor one of the league's most dominant units in 2011. He should fit right in with Bears special teams coordinator Dave Toub. Costanzo has never had a meaningful role on defense since entering the league in 2007, and that's unlikely to change next season.

CSN Bay Area's Matt Maiocco reports free agent LB Blake Costanzo "will not be back with the 49ers." A special teams ace, Costanzo has reportedly already drawn two offers. He's made just 55 tackles in 61 career games, however, and is unlikely to land major defensive snaps wherever he ends up.

The player rep for free agent LB Blake Costanzo says he had a "positive dialogue" with the 49ers, but there have been "no contract negotiations whatsoever." "Blake would love a chance to go back and play for San Francisco," agent David Canter said. A favorite of special teams coordinator Brad Seely, Costanzo ranked second with 17 tackles on one of the most dominant special-teams units of the past decade.

Free agent LB Blake Costanzo is visiting the 49ers Wednesday. New special teams coordinator Brad Seely had Costanzo as one of his star pupils in Cleveland last year.