"Matt was unable to go," Haley said. "He was beat up there at the end. I will let you know later in the week."
Cassel left the stadium wearing a cast on his right hand, according to The Kansas City Star. Cassel wouldn't provide any details during his postgame news conference, protecting the nature of his injury. He said he wanted to go back in, but was told by the team's medical staff he could not return.
"I don't want to get into specifics, but yes, I couldn't go back into the game," Cassel said.
Palko said he didn't know why he was told to go into the game, and Cassel vowed that he'll be ready for next Monday night's game against New England "unless I'm told otherwise."
Cassel wasn't effective in the 17-10 home loss, completing 13 of 28 passes for 93 yards and a touchdown.