Johnson's comment came after Josh Nesbitt was held out again with a sore hamstring in Wednesday's practice.
Nesbitt, a sophomore, started the first four games but strained his right hamstring on the Yellow Jackets' opening drive against Mississippi State on Sept. 20.
Johnson, the first-year coach, said it is still possible Nesbitt will play against Duke.
SOUTH CAROLINA: Finally, coach Steve Spurrier had some good news about his troubled offense.
Injured Gamecock star wideout Kenny McKinley has practiced extensively this week and Spurrier says he'll play Saturday at Ole Miss.
"Kenny was running around decently and he's expecting to play some," Spurrier said after practice. "We'll see how much as he goes. But he'll suit and go play."
KENTUCKY: An attorney for strong safety Ashton Cobb entered a not guilty plea on his behalf on charges of stalking and terroristic threatening.
Cobb is accused of threatening his ex-girlfriend with telephone calls and text messages.
He has been suspended from the school since his arrest Friday. Coach Rich Brooks said Monday that he has applied for reinstatement.
ARKANSAS: Defensive lineman Ernest Mitchell has undergone an arthroscopic knee operation after an injury in last weekend's loss to Texas. Coach Bobby Petrino said he wasn't sure how long Mitchell would be out.
NOTRE DAME: Tight end Will Yeatman will be sentenced on previous misdemeanor charges of driving while intoxicated and reckless driving after being cited as a minor consuming alcohol. prosecutors said.
He faces up to 180 days in jail.
NO. 17 BOISE STATE 38, LOUISIANA TECH 3
In Boise, Idaho, Kellen Moore threw for two touchdowns and D.J. Harper rushed for two more to lead Boise State.
The Broncos (4-0, 1-0 Western Athletic Conference) got another impressive effort from their defense in beating the Bulldogs (2-2, 0-1) for the seventh consecutive time.