"I had cancer in my lymph nodes and had to have surgery last March," Clarkson said. "I went through a pretty intense chemotherapy and it made my body pretty weak. I pulled my hamstring in the pre-season as a result and had to miss the first three games of the season.
"I went out there and played the rest of the season at about 75% but even now, I still can't do sprints or a lot of running. Lucky for me, I'm a lineman and as long as I stay in that 10 yard box, I'm good to go."
Clarkson committed last October to Oregon State and said he's still rock solid in his decision.
"I can't wait to play for Coach Cav (Cavanaugh)," Clarkson said. "He gets the best out of his lineman and is just a great coach. He has put a lot of guys in to the NFL and is both tough and shows he cares for you as a person as well.
"I love Coach Riley as well, he's a lifer at Oregon State and there is no worry about him going anywhere else. They're bringing me in as a center but I can play guard as well. They have Isaac Seumalo at center right now and he's an incredible player. I can't wait to learn from him so it will be cool to play some guard right next to him and learn and then take over that spot when he leaves."