Oregon quarterback Vernon Adams Jr. left the Alamo Bowl after taking a hard hit to the head and didn't immediately return at the start of the second half.
Adams collided with TCU linebacker Derrick Kindred late in the second quarter after the players knocked heads on the tackle. Adams stayed on a ground for several minutes before walking off the field and to the Oregon locker room for evaluation.
Oregon led 28-0 when Adams left and 31-0 at halftime.
Adams completed 13 of 19 passes for 197 yards and Oregon's first touchdown, a 37-yard pass to Darren Carrington. Adams was replaced by Jeff Lockie, who started the third quarter.
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An Oregon official said there would be no immediate update on Adams' condition.