Keisel is visiting with the Cardinals on Tuesday, NFL.com reports. Keisel potentially signing with the Cardinals comes after defensive end Darnell Dockett suffered a torn ACL on Monday. Additionally, Keisel played under Cardinals' coach Bruce Arians from 2004-2011, while Arians was an assistant coach for the Steelers. In 12 games last season, the 36-year-old Keisel posted 29 tackles (20 solo) and four sacks.