TEMPE, Ariz. -- Arizona Cardinals quarterback Matt Leinart was placed on injured reserve Tuesday, ending his second NFL season after just five games.
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He was placed on injured reserve Tuesday, two days after his injury during a victory over the St. Louis Rams. Backup quarterback Kurt Warner, who has seen steady action this season, replaced Leinart before halftime and finished the game.


The Cardinals signed Tim Rattay as a backup for Warner. The eight-year veteran played in four games last year for the Tampa Bay Buccaneers and completed 61 of 101 passes. He played for the San Francisco 49ers for six years before being traded to the Bucs.


Leinart fractured his left collarbone while getting sacked and immediately left the game. He spent the second half on the sidelines.


Coach Ken Whisenhunt had been using Warner in a platoon situation with Leinart, using the veteran during no-huddle situations. Leinart, the USC standout and Heisman Trophy winner who was the team's first-round pick in 2006, hasn't commented about his injury.


Arizona also signed guard Keydrick Vincent on Tuesday and released center Chukky Okobi.