In that 40-10 win over Green Bay, Slay had three passes defensed and two tackles.
"You know, he had some things, he had some growing pains," new defensive coordinator Teryl Austin told the team's website. "There were some times he didn't look very good and there were some times he looked outstanding.
"Our goal is to try to get him to be consistent, to be a consistent player. That way, that talent will start to take over."
A knee injury cost Slay three games. He finished with 34 tackles and six passes defensed. He'll get every opportunity to earn a starting job in 2014, according to the website.
Delmas has been playing through a knee injury all season. Mathis has an illness, but practiced in full all week.
Slay is dealing with a knee injury. He did not practice Wednesday and Thursday, but returned on a limited basis Friday.