A little over a year later, the four-star LSU commit finds himself in San Antonio at the U.S. Army All-American Bowl, fully recovered and prepared to take his game to the SEC.
"Coming back mentally all the way from my knee, it's been a big thing for me," said Rettig. "I was just trying to get back into it, like this season, and now that I'm here, I feel like I'm doing well. The players have been saying I'm doing good. They're breaking up the reps evenly so this week had been going good."
Rettig is one of a handful of LSU verbals on the West.
"We have a lot of LSU fans telling us to do good," said Rettig. "Desean Smith and John Diarse, they catch everything and Josh Boutte, he's a big dude and he's funny and Tre'Davious White, he plays corner so we've gone against him."
Rettig graduated early from Cathedral, and he'll head to LSU next week.
"I'm graduating early so I'll be there on the 10th of January," said Rettig. "I'll be there for spring practice and it's a lot of fun to think about playing in the SEC. The SEC is the hardest league, so it will be fun and hopefully it matches out for me. I feel like if I work hard, it will be the same thing for me and come naturally. I just have to go in and work. At the end of the day, if I work hard and do exactly what I'm doing and just put my head down and focus, everything will sort itself out."