Aggies head coach Kevin Sumlin watched it all unfold for the past two seasons.
Wednesday, Sumlin's sized up Manziel's impact at Texas A&M and what he expects in the NFL.
"He went from a guy that really nobody knew nationally, to a household name. And he continued to play at a high level, I think. You know people ask me all the time, I won't be shocked when his pro day goes very, very well and I won't be shocked when he has a really, really solid pro career," said former NFL quarterback, Donovan McNabb.
McNabb arrived in College Station, hosting his national radio show.
He believes Manziel is the total package
"I've seen a lot of guys who have the 'it' factor and Johnny has the 'it' factor. And I think probably five, 10 years from now we'll look back on the last five years here in college; you'll bring up Cam Newton, you'll bring up Johnny Manziel, you'll bring up Tim Tebow and it will bring excitement to the quarterback position," said McNabb.