Kansas City, MO - Chiefs quarterback Matt Cassel has left the field favoring his left leg after being sacked on the third play of Kansas City's game against Seattle.
Cassel was sacked by Brandon Mebane on the first passing play. He appeared to have a problem with his left leg, but came off the field unassisted before being replaced by Tyler Thigpen.
Cassel signed a long-term contract with a guarantee of $28 million after being acquired in an offseason trade with New England.
Posted: 8/30/09 5:55PM ET