Seattle Seahawks star quarterback Russell Wilson revealed in a commencement speech at Wisconsin that a coach at NC State told him he'd never be an NFL quarterback.
Here's an excerpt from that speech, per Sheil Kapadia of ESPN:
The summer before my senior year of college, I’m playing minor-league baseball. I called my football coach at NC State and said, ‘Hey coach, I’d like to come back for my senior year.’ He told me I wasn’t coming back. He said, ‘Listen son, you’re never going to play in the National Football League.