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Renton, WA (Sports Network) - The Seattle Seahawks will be without Pro Bowl cornerback Brandon Browner for the final four games of the regular season after being suspended by the NFL for violating its policy on performance- enhancing substances.

NFL.com had reported in late November that Browner and fellow starting cornerback Richard Sherman had both tested positive for the prohibited stimulant Adderall. According to the Seattle Times, Browner was believed to have dropped his appeal of the penalty, with Sherman's case still pending.

The former CFL standout will be eligible to return to Seattle's active roster on Dec. 31, one day after the team's regular-season finale against St. Louis, and would be available if the Seahawks reach the playoffs.

Seattle enters Week 14 in control of the second and final Wild Card spot in the NFC with a 7-5 record and is within 1 1/2 games of first-place San Francisco in the West Division.

Signed by Seattle prior to last season following a successful five-year stint with the CFL's Calgary Stampeders, Browner started all 16 games for the Seahawks in 2011 and registered a team-high six interceptions along with 54 tackles and 23 passes defensed. The 28-year-old was named to the NFC roster for the Pro Bowl as an injury replacement for San Francisco's Carlos Rogers in January.

In 12 games this season, Browner has recorded three interceptions along with 44 tackles and three forced fumbles.

To help shore up the secondary, the Seahawks signed cornerbacks Ron Parker and DeShawn Shead on Wednesday. Parker, who played in two games with Seattle last season, was plucked from the Carolina Panthers' practice squad, while Shead was elevated from the Seahawks' practice squad.

Seattle had an open roster spot after releasing veteran wide receiver Braylon Edwards with an injury settlement on Tuesday.