As Johnny Manziel prepares to enter the NFL, he is hearing questions about whether he is tall enough to succeed at quarterback in the pros.

The 6-foot Texas A&M quarterback needs only to point to this month's Super Bowl to make his case. Seattle quarterback Russell Wilson, who is listed at 5-foot-11, led the Seahawks to the championship.

"I think he's kicked the door wide open (for shorter quarterbacks)," Manziel told the Houston Chronicle. "You're seeing more guys being successful avoiding that first wave of pressure -- get out and do things outside the pocket.

"Wilson does some things he's not asked to do, when things don't go exactly as scripted. He's able to extend the play. One reason they were so successful early in the Super Bowl was that he was four-of-five on third down and was able to continue to push the ball down the field and get them where they needed to be."

He added about quarterback play in the NFL, "The game's evolving. More and more (pass rushers) like (defensive end Jadeveon) Clowney are coming out of college, and they're big, and they can run. You have to be able to create plays.

"I want to be a pocket passer, too, and be able to pick apart defenses and beat teams with my arm. But when a play breaks down, the scrambling and running ability (take over), and we're back to doing what I've been doing the past six years playing football."

Manziel said NFL teams would learn at the upcoming scouting combine that he is taller than Wilson.

"I'm 72 inches on the dot," he told the Chronicle between workouts in San Diego. "If they want to try to jump on my shoulders and squish me down, it's not going to be any less than that."

NFLDraftScout.com lists Manziel as the No. 3 available quarterback and the No. 7 overall prospect. Rob Rang of NFLDraftScout.com projects Manziel to be selected third overall by the Jacksonville Jaguars, while the website's Dane Brugler sees Manziel going No. 4 overall to the Cleveland Browns.

Manziel won the 2012 Heisman Trophy as a redshirt freshman, then finished fifth in the Heisman voting last year.