Justin James "J. J." Watt (born March 22, 1989) is an American football defensive end for the Houston Texans of the National Football League (NFL). He was drafted by the Texans with the 11th pick in the first round of the 2011 NFL Draft, and played college football at Wisconsin.
Justin James "J. J." Watt played basketball in middle school. 
Even if he now plays football, it's possible he played basketball in middle school-- children often play multiple sports. I think the system saw that I specified he plays a sport other than football, so flagged it as incorrect. 