Vikings coach Mike Zimmer said that Johnny Manziel's Pro Day workout at Texas A&M was a "sideshow."

Well, Zimmer took it a step further, publicly revealing he has some concerns about the former Heisman Trophy winner after meeting with him following his Pro Day.

Appearing on radio station 104.9 The Horn in Austin, Texas, Zimmer explained why he's a tad weary about Manziel.

“We asked him all kinds of questions. ... There are some flags that come up,” Zimmer said.  “All of the things that happened out in Los Angeles, the commercials and all that stuff; the position of quarterback in the NFL is such an important position and the reason these guys need to be a totally football-minded guy is the pressure of the position and being the face of an NFL team and doing everything right. That’s the thing you want to know about him -- will he be into work early every single day? Will be the last to leave? Will he be the guy that is working the hardest to get better?"

Since his stunning redshirt freshman season at Texas A&M, Manziel has been a high-profile figure, essentially becoming a national celebrity before embarking on an NFL career.

He's been criticized for partying underage and was involved in a mini-controversy when he prematurely left the Manning Passing Academy last year. He was engulfed in a larger controversy when it was alleged he was paid to sign autographs, though he only served a half-game suspension as punishment.

As a college athlete, he struck a friendship with rapper Drake and since making the decision to leave amateur athletics, he recently made a cameo in a recent McDonald's commercial featuring LeBron James.

Zimmer's point seems to be centered on the type of person Manziel sees himself at this level. With the Vikings needing a quarterback and picking eighth overall, he's going to leave no stone unturned.

“I guess the thing you have to figure out is, is this just another part of the things that happened a couple of years ago after he won the Heisman Trophy or is he just a different person as far as wanting the limelight or just wanting to prove that he can do things the right way,” Zimmer said. “I guess it maybe brings a few questions marks in. Is he going to conform to typically what the NFL is or what everyone else has done before him including what the great players in the game have done before him, or is he going to try to be the celebrity man guy that he was maybe a year-and-a-half ago?”

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Aaron Wilson covers the Ravens for The Baltimore Sun.