The Seahawks lost veteran defenders Brandon Browner, Walter Thurmond and Chris Maragos from their secondary leaving young players such as Simon - who missed the 2013 season - to replace them in the lineup in the 2014 campaign.
Richard told the club's official website: "It's time for Tharold Simon to step up. It's next man [up]. Let's go."
The 23-year-old was selected in the fifth round of the 2013 Draft.