Arians' Cardinals count on improved offensive line

Keeping Carson Palmer upright is priority No. 1 for the Arizona Cardinals.

That means the pressure is on the offensive line, the biggest question mark on the team entering training camp.

The Cardinals allowed an NFL-worst 58 sacks in 2012, and with new coach Bruce Arians' love of the deep pass, improvement up front is essential.

While Arians won't commit to a starting lineup for the regular season, if current trends hold, three of the five Arizona linemen will be new from last season.

Levi Brown, who missed all of last year with torn triceps, moves back to left tackle, with first-round draft pick Jonathan Cooper at left guard and late free agent acquisition Eric Winston at right tackle.