Mack was considered one of the Nittany Lions' best rising prospects after his one year in Happy Valley.
The Nittany Lions are 0-2 as underdogs this season.
The game featured 14 lead changes and 11 ties.
The Nittany Lions most recently beat the Fighting Irish 31-10 in the first full Beaver Stadium White Out.
"I'm a believer. I wasn't a believer in Penn State early on. I'm a believer right now."
The freshman underwent heart surgery on November 22 and has been recovering at home.