Two sport star, Bo Jackson, revealed that he would never let his children play football.

Jackson, who as a football player won the Heisman, Walter Camp, and Chic Harley awards as well as becoming a two time All American and a Pro Bowler, only played in the National Football League from 1987 to 1990. Jackson was also a stellar baseball player who played in the MLB from 1986 to 1994 and was an All Star as well as the All Star Game Most Valuable Player in 1989. In an interview with USA Today Sports, Jackson revealed that he only would have played baseball had he known the facts about Chronic Traumatic Encephalopathy.

“If I knew back then what I know now,” said Jackson, “I would have never played football. Never. I wish I had known about all of those head injuries, but no one knew that. And the people that did know that, they wouldn’t tell anybody.”

Jackson also spoke on the changing knowledge surrounding the long term effects of the game. For Jackson, the players getting larger, stronger, and faster can only be adding to the probability of players suffering concussions.

“The game has gotten so violent, so rough. We’re so much more educated on this CTE stuff, there’s no way I would ever allow my kids to play football today,” Jackson said. “Even though I love the sport, I’d smack them in the mouth if they said they wanted to play football. I’d tell them, ‘Play baseball, basketball, soccer, golf, just anything but football.'”