Texas Tech spokesman Chris Cook didn't have specifics on whether Harrell's fingers got caught in a facemask or slammed against a helmet in Saturday's 35-28 win over Baylor.
ESPN.com first reported the details involving the nation's leading passer.
Surgeons inserted 17 pins and two plates into the pinkie and ring finger of Harrell's left hand.
Harrell, a contender for the Heisman Trophy, will play when the No. 8 Red Raiders (11-1) appear in their ninth straight bowl, likely the Cotton Bowl.
The fifth-year senior played in the second half and finished with 309 yards and two touchdowns, the second one coming midway through the fourth quarter to cap a 21-point rally by the Red Raiders.
Without breaching his own policy on commenting on injuries, coach Mike Leach called Harrell "incredibly courageous" for his second-half performance.
"Even though (I have) no specific comment, it's just further evidence on why he should get the Heisman, and to me it's a no-brainer because I thought he should have gotten it last year," Leach said Monday.