Halliday took several hard hits in the 30-27 overtime loss, though he was never sacked.
Two sources in position to know Saturday night told CF.C suggested that it could be related to his liver and that it could be lacerated. That was confirmed today, as Halliday suffered a lacerated liver at some point in the game.
The injury will put Halliday out of the Apple Cup and is likely to require a limit of physical activity for at least several weeks.
WSU coach Paul Wulff, unaware of Halliday's injury at the time, complimented the youngster after Saturday's game.
"Connor's a tough kid," Wulff said. "If you're going to play quarterback, you've got to be tough. He took some hits today."
"He played great," WSU wide receiver Jared Karstetter said. "For a young kid that got hit as much as he did, and to stay poised; he was getting killed out there."
A Washington State press release Sunday afternoon said Halliday will "indefinitely" remain in the intensive care unit at Pullman Regional Hospital.
According to the release, Halliday "approached the WSU medical staff with significant pain following the game. He was immediately taken to the hospital."
Halliday passed for 290 yards (despite several dropped balls) and two touchdowns in his first start. He was intercepted four times, but he often faced a strong pass rush.
"Their freshman quarterback is a heck of a player," Utah coach Kyle Whittingham said.
"I was pretty proud of him," said Todd Sturdy, WSU's offensive coordinator and quarterbacks coach.
Halliday earned the start after he played most of the game the previous week and passed for 494 yards and four touchdowns in a win over Arizona State. The passing yardage ranks second in WSU history and 10th in Pacific-12 Conference history.
HALLIDAY OUT FOR APPLE CUP
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