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National Football League (2004–2005)
After his final match at WrestleMania XX, Lesnar sidelined his career in WWE to pursue a career in the National Football League. This move upset many in WWE, as the company felt they had invested heavily in Lesnar. World Wrestling Entertainment confirmed Lesnar's departure on their official website WWE.com by the statement
Brock Lesnar has made a personal decision to put his WWE career on hold to prepare to tryout for the National Football League this season. Brock has wrestled his entire professional career in the WWE and we are proud of his accomplishments and wish him the best in his new endeavor.
Lesnar later told a Minnesota radio show that he had three wonderful years in WWE, but had grown unhappy and had always wanted to play pro football, adding that he did not want to be 40 years old and wondering if he could have made it in football. In an interview about starting with the NFL, Lesnar made the statement
This is no load of bull; it's no WWE stunt. I am dead serious about this... I ain't afraid of anything, and I ain't afraid of anybody. I've been an underdog in athletics since I was 5. I got zero college offers for wrestling. Now people say I can't play football, that it's a joke. I say I can. I'm as good an athlete as a lot of guys in the NFL, if not better... I've always had to fight for everything. I wasn't the best technician in amateur wrestling. But I was strong, had great conditioning, and a hard head. Nobody could break me. As long as I have that, I don't give a damn what anybody else thinks.
Lesnar played for the Minnesota Vikings, where he created controversy in some games by starting minor fights and got heat from the Kansas City Chiefs for a sack on quarterback Damon Huard, which drew a big response from the crowd. Huard was hit hard and had to go to the sidelines and sit out a few plays. After playing in the preseason, Lesnar ended up being a late cut. He declined an invitation to play as a representative of the Vikings in NFL Europa because he wanted to be closer to home with his family.