McCarron is wearing the boot because of an ingrown toenail, Alabama coach Nick Saban confirmed to ESPN's Chris Fowler.
McCarron practiced all week without incident.
"AJ practiced all week, will play tomorrow and [wearing the boot] is just a precautionary measure," an Alabama spokesperson told ESPN.
According to AL.com, Alabama players frequently use walking boots for minor injuries.
The No. 1 Crimson Tide take on Virginia Tech at 5:30 p.m. ET Saturday (ESPN) at the Georgia Dome.