The Seahawks will work out quarterback Josh Johnson on Friday, Ian Rapoport of NFL.com tweets. Johnson was most recently with the Raiders, though his stint in Oakland lasted only a couple of months. 
Johnson has not thrown a pass in a game since 2011, but he’s remained on rosters as a backup. Last year, the Texans added him after Deshaun Watson‘s season-ending injury. He’s traveled all over since 2009 and has taken snaps for the Bucs, Browns, Bengals, and 49ers.
The Seahawks’ QB depth chart currently consists of star Russell Wilson, backup Austin Davis, and seventh-round pick Alex McGough. The Seahawks obviously like McGough after selecting him just a few months ago, but they may feel that they can sign a veteran such as Johnson, sneak McGough through waivers, and then sign the rookie to the practice squad.