ST. LOUIS -- Arizona Cardinals quarterback Matt Leinart fractured his left collarbone while getting sacked late in the first half of Sunday's 34-31 victory over the St. Louis Rams.
Coach Ken Whisenhunt said Leinart, the team's first-round pick in 2006, would be out indefinitely.
"We don't know how long it's going to be," Whisenhunt said. "But it's going to be for an extended period of time."
Leinart returned to the sideline after halftime, wearing a T-shirt and shorts and with his arm in a sling. A team spokesman said Leinart had no comment.
Leinart was hurt on a sack for a 9-yard loss by blitzing Rams linebacker Will Witherspoon, which knocked the Cardinals back to their 7-yard line. He was replaced by Kurt Warner, who earlier in the second quarter led the Cardinals to their first touchdown.
Leinart walked off the field with his left arm held close to his chest. He was 7-for-13 passing for 100 yards and an interception.
Copyright 2007 by The Associated Press