The 6-foot-2, 250-pound Harris finished seventh on the Ravens in tackles last season with 73 to go along with two sacks and two interceptions following Ray Lewis' season-ending shoulder injury. Harris, 31, is a former starter for the Green Bay Packers who earned a Super Bowl ring in 1996.
Meanwhile, the Houston Texans announced the addition of unrestricted free agent outside linebacker Shannon Taylor. Taylor started twice for Baltimore last year before being replaced in the lineup by Cornell Brown.
The Ravens had reportedly rescinded their contract tender offer to Taylor last week. Taylor had 14 tackles and forced a fumble last year, but his playing time dwindled rapidly as Brown worked his way back into shape after being re-signed during training camp.
Brown recently signed a four-year contract with a total base salary of $2.9 million.
That deal is unlikely to preclude the Ravens from continuing to search for a pass rusher such as former Cleveland Browns outside linebacker Jamir Miller who has been linked as a potential target to Baltimore, Tampa Bay and Kansas City in published reports.
A Pro Bowler in 2001, Miller missed last season with a torn Achilles' tendon and was released by Cleveland on Feb. 27. Miller's agent, Leigh Steinberg, wasn't available for comment.
And former San Francisco 49ers defensive end Chike Okeafor's agent, Andrew Simms, said he has held brief discussions with Baltimore, but no visit or negotiation is impending.