"I am de-committed from South Carolina and I will chose between either Auburn or Florida and will announce my decision on Wednesday," he said. "I am going to make the announcement at my school."
Commenting on why he picked the Tigers and Gators as his finalists, he said, "I really like the people at Auburn, the coaches and the whole area. I feel real comfortable there.
Mack, an Under Armour All-American, is a 6-3, 328-pounder who is ranked as a four star prospect by Scout.com.
"I like Florida because it has a really good football program and it is one of the top teams in the country."
Mack took an official visit to South Carolina this past weekend.
Offensive linemen are a high priority for Auburn's 2010 class, which is currently ranked fifth nationally by Scout.com.
Mack is expected to make his announcement at approximately noon local time (EST) at his school. Inside the Auburn Tigers will have complete coverage of his press conference.