McCoy hurt his throwing hand in the second quarter of the 16-13 win Saturday over Oklahoma (No. 25 AP). He struggled through one of the worst passing games of his career, completing 21 of 40 for 127 yards with one touchdown and one interception.
Team trainers checked out the thumb to make sure there wasn't more significant damage.
"It's sore but it's not going to keep me out," McCoy said. "It's football."
McCoy had limited range of movement with the thumb Monday. No. 3 Texas (6-0, 2-0 Big 12) didn't practice, giving him an extra day's rest before he needed to throw again.
Although the nail didn't look discolored, McCoy says he's been told it will fall out.
McCoy had a few passes look wobbly and misfired on others in the second quarter against Oklahoma. The thumb didn't seem to bother him on a third-quarter touchdown pass to Marquise Goodwin.