John Ross missed the entire 2015 season (his junior year) due to a knee injury. He initially injured his right knee on 13 September 2014 victory over the Illinois Hoosiers. That injury forced him to miss the following week’s game, but nothing more:
"“It was a kickoff return,” Ross said. “Just got rolled up on pretty good. And I felt something in my knee, but I didn’t think nothing of it. My knee swelled up after the game. And it never really went down. But I was worried if I said something, I probably would have to sit out for the rest of the season.”"
He played through the season with a bum knee, taking one for the team. But that may not have been the wisest move:
"here were days when my leg was so stiff I couldn’t run,” Ross said, “night games where it was harder for me to get warmer because I had that swelling in my knee. The swelling did not go down at all. There was no chance of the swelling going down. The doctor ended up telling me after I got the MRI after the season, I waited so long, [the knee] started to heal itself. I don’t know if that was good or bad.”"