The Raiders remained primarily in a defensive stance with regard to free agency Tuesday, announcing the signing of cornerback Tracy Porter.

Porter, whose pending deal with the Raiders was first reported by ESPN, is the seventh defensive player added to the roster since free agency began.

Given how thin the Raiders are at cornerback, Porter, 26 and coming off an injury-plagued season, with the Denver Broncos, is a likely starter. The only other cornerbacks on the current roster are Chimdi Chekwa, Brandian Ross and Phillip Adams, who have a combined total of four NFL starts.

A veteran of 43 starts over five seasons, Porter has eight career interceptions and two regular-season touchdowns, not including a 74-yard interception return against Peyton Manning for the New Orleans Saints in Super Bowl XLIV.

Raiders coach Dennis Allen was the defensive backs coach for the Saints when Porter was a starter there.

Last season, Porter experienced had issues with seizure-like symptoms in August and October and was limited to six games and four starts. When his medication was regulated and Porter returned to action in December, he sustained a concussion that sidelined him for the rest of the season.

Since free agency opened, the Raiders have signed linebackers Kaluka Maiava (Cleveland), Nick Roach (Chicago) and Kevin Burnett (Miami), defensive tackles Pat Sims (Cincinnati) and Vance Walker (Atlanta) and defensive end Jason Hunter (Denver).

Offensive tackle Alex Barron (St. Louis) is the lone offensive free agent signed from outside the organization.

Nine Raiders who were either released or had their contracts expire have signed with other teams: punter Shane Lechler (Houston); safety Michael Huff (Baltimore); defensive end Matt Shaughnessy (Arizona); tight end Brandon Myers (N.Y. Giants); running back Mike Goodson (N.Y. Jets); defensive tackle Desmond Bryant (Cleveland); linebacker Philip Wheeler (Miami); safety Mike Mitchell (Carolina); and wide receiver Darrius Heyward-Bey (Colts).

-- Quarterback Matt Flynn will wear No. 15 for the Raiders. He is the fourth quarterback in franchise history to wear No. 15, joining Jeff Hostetler (1993-96), Mike Rae (1976-77) and Tom Flores (1960-66).

For more on the Raiders, visit the Inside the Oakland Raiders blog at ibabuzz.com/oaklandraiders. Follow Jerry McDonald on twitter at Twitter.com/Jerrymcd.