Warner knocked out after hit to the head

ST. LOUIS -- (AP) Arizona Cardinals quarterback Kurt Warner left Sunday's game against the St. Louis Rams after taking a blow to the head in the second quarter, and the team said his return was questionable.

Warner was 15 for 19 for 203 yards and two touchdowns, helping the Cardinals take a 21-3 lead. It was unclear when Warner was injured although he took a hard hit from safety O.J. Atogwe on a blitz on his last drive.

Warner, a two-time NFL MVP with the Rams, was facing his old team for the seventh time since joining the Cardinals in 2005. Matt Leinart replaced Warner late in the second quarter.

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