Clemson was the first college to offer him and also recruit him. They offered on 5/21/12.
Register attended the Dabo Swinney football camp in June 2012. In 2012, he had 110 tackles and 7 sacks. In 2011, he had 89 tackles and 8.5 sacks. As a senior, his high school team won the 4-A state championship.