McCann played in eight games for Miami last season. In 2011, he played in 12 games with Dallas, Baltimore and Oakland. He began with the Cowboys as an undrafted rookie free agent in 2010.
Taylor has played in 12 games for San Francisco in his career. He was on the 49ers' practice squad last postseason after signing with the team on Dec. 26.
In addition, running back Alfonso Smith re-signed with a one-year deal.
The Cardinals also announced their preseason opponents. They will open on the road against Green Bay, then play home games against Dallas and San Diego, then finish with a game at Denver. The dates have not been announced.