Cardinals quarterback Matt Leinart fractured his left collarbone while getting sacked late in the first half of Sunday's 34-31 victory over the 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 Out Indefinitely With Broken Collarbone