Sixth-round pick Chris Harrington signed a three-year contract Thursday.

The Cardinals now have four rookies under contract after sixth-round pick Chris Harrington signed a three-year deal Thursday.

The news comes a day after seventh-round pick Brandon Keith signed his own three-year contract.

As is their custom, the Cardinals did not release financial details.

The Cards have three rookies left to sign: top three picks Dominique Rodgers-Cromartie, Calais Campbell and Early Doucet.

Harrington is attempting to move from the defensive end position he played at Texas A&M to linebacker for the Cardinals.

The 6-foot-5, 264-pound Harrington had two sacks in his final year of college and 15 sacks total. The Cards envision him in the same hybrid defensive end/linebacker role that Bertrand Berry and Travis LaBoy currently play.

"I have every year of my career taken a defensive end and transformed him into a linebacker, so I know what to look for," linebackers coach Bill Davis said. "The first thing you need is a solid pass rusher and Chris has that as a defensive end. Then there (has to be) enough athleticism to drop (in coverage). The third is playing the tight end physical.

"He hasn't had to drop, just like Chike (Okeafor) and Bert Berry and Travis (hadn't). But he is picking up how to do it well. He just needs a lot of reps."

The Cardinals report to training camp July 23. Wednesday was the final day of offseason workouts for the team's rookie class, although Harrington stayed an extra night in order to sign his contract.

Contact Darren Urban at askdarren@cardinals.nfl.net. Posted 7/10/08.